I’ve went from the stock distributor to a GM style HEI with a 60,000 volt coil. ... Autolite 3923 - Autolite Copper Core Spark Plugs. motor. > When I searched on your site for the correct Spark > plug; it came up 5224. > Quick question. Autolite 3924 or cooler 3923 Many Dakota owners who drag race their trucks recommend this relatively inexpensive plug, and some claim to have chassis dyno results showing 4-5 hp As long as the center electrode is burning off the carbon deposits and appears relatively clean, then the heat range is probably correct. I saw an article were Roush was using Autolite 3923 spark plugs on their strokers (aluminum heads of course). Shop for Autolite Copper Core Spark Plug Part #: 3924 for your vehicle. I've been using Autolite 3924's in my Vic Jr. headed 393. Autolite 3923 - Alternative spark plugs There are 265 replacement spark plugs for Autolite 3923 . But that’s just some basic fitment info, many companies offer different types of plugs, so you’ll have to do some research to see if you’ll have any benefits beyond a stock plug. Get it as soon as Tue, Aug 11. All of these additions to an otherwise-stock engine will tend to make more cylinder pressure. If you are gettting pinging now, it could be carbon buildup on the piston crowns. Asking lots of questions and seeking professional guidance from engine builders can help with the process. regards, Autolite plugs are superior. The proper solution would be to solve the oil consumption issue first. They contain an Yttrium-enhanced alloy, which enables up to 8 percent reduction in side wire temperatures for improved durability and less preignition. 0617 FRAM Group IP LLC West Field Court Lae Forest IL 00 Printed in USA Understanding Heat Range Working closely with engine manufacturers, Autolite engineers have developed plugs in I have a 65 chevelle with a stroked 327 into a 360 ci, aluminum strike force heads, dougs headers and aggressive cam that produces no vacuum with a full petronix ignition system, motor has about 200 miles on it and although I don’t race it, i don’t like to get beat at a stop light, what would you recommend? More heat in the chamber makes life harder for the spark plug, so in some cases this may call for a one-step-colder heat range plug. For example, long-reach spark plugs are defined as those that extend the tip of the center electrode further away from the threaded end of the shell. Delivery: Dec 31-Jan 01. I know spark plugs have heat ranges but does it really matter … > People have said that the 3924 or 3923 work great in > my truck. non biased Shelby Cobra related site! This is one of the primary ways of causing pre-ignition where combustion is initiated before the ignition fires the plug. Standard Delivery. Not sure if this is enough information or not! TECHNICAL INFORMATION REAL PERFORMANCE. But does it matter? Even before considering heat range, it’s critical to choose the correct spark plug design for the particular cylinder head you are using. > Subject: Autolite Copper VS. Autolite Copper Spark Plug 3923. Your email address will not be published. Free In-Store or Curbside Pick Up. These issues would need to be solved before you can make a true decision as to spark plug heat range. Free In-Store or Curbside Pick Up. Autolite 3923 Nickel Spark Plug Replacement Information AutoliteSparkPlugs.com is part of the SparkPlugs.com family, an authorized Autolite dealer. Due to differences in design and material, plugs produced by various manufacturers do not have exactly the same heat range. Said to check them as they could get closed up due to handling etc . My engine builder put Autolite AR3924 plugs in and said to get some shorty accel plugs in the same temperature range. Pinch with 2 fingers to zoom. Beyond just heat range applications are issues with the way the spark plug is configured. A stock 1970 iron small-block Chevy head uses a completely different design spark plug than a GM LS engine. I looked up the 300C and both the 5.7L and 6.1L SRT engines use the same plug. TECHNICAL INFORMATION REAL PERFORMANCE. Re: NGK 4435 vs Autolite 3924 in TFS head comparison « Reply #9 on: August 28, 2011, 12:27:21 pm » the end of the 4435 doesnt have threads, just a smooth section ~ 1/4in or so. This has the LS spark plug info on it. I'd try them and see if there is any change. Part Number: 417-AR3924. I asked about changing gaps per what MSD said about opening the gap as I … Autolite replacement racing spark plugs are the preferred choice for many professional racers. Zeppo – Or, perhaps you are considering racing your car in autocross or a track day at a road course. This is the stock heat range plug and there is likely no reason to run anything but a stock heat range. The key to a heat range selection is related to selecting a plug that will efficiently burn-off carbon deposits from the center ceramic during normal use of the engine. I asked about changing gaps per what MSD said about opening the gap as I … Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Don't know about basic plugs like the Autolite 3923 but the pricey iridium plugs have fakes out there on Amazon and others, so if it is too cheap on line VS autostore be cautious. Let’s use a small-block Chevy as an example. Spark Plug; Copper; Resistor; Autolite Copper Spark Plugs are … Autolite Double Platinum Pro APP3924 (APP3923 is a colder heat range platinum plug) The two P's indicate two platinum nibs on the electrodes where the spark jumps. Hey guys, changen my plugs and i was told to use the 3924's by a few people. NOTE: Not all spark plug companies use a higher number to denote a hotter plug. Ships on 12/28/20 Notify me when this product is back in stock. A hotter plaug may be better suited to lots of city riding. … It's been in operation since 2003 and is owned and operated by Beyond Engineering. I've been using Autolite 3924's in my Vic Jr. headed 393. Est. https://www.onallcylinders.com/2018/05/11/ask-away-jeff-smith-determining-correct-spark-plug-heat-range/ Home Delivery. Register today for access to special offers and exclusive content. 4.5 out of 5 stars. Part # 3923. SKU # 117680. check if this fits your vehicle $ 2 89. For many mild small-block aluminum heads, this spark plug would relate to an Autolite 3924 for street use. I have had switched over to platinum Bosch 4417 platinum +4 which have really worked well. 10 product ratings - Spark Plug-Platinum Autolite AP3924. 888-800-9629 For example, take the 254x plug series. Free In-Store or Curbside Pick Up. Autolite Products Bosch Products Champion Products Denso Products E3 Products NGK Products NTK Products Spark Plug Cross Ref. For example, 3923 has a heat range of 3. Delivery: Dec 31-Jan 01. This design is very popular with near-stock engines as this improves combustion efficiency by moving the hot end of the spark plug nearer to the center of the cylinder. Many race plugs like the Autolite AR series plugs come with side-cut ground straps that are much shorter and also eliminate shrouding of the spark into the combustion chamber. Autolite has 2544, 2545 and 2546 available. I have a stock Ford dual plane square bore intake and on top of it I’m running a Carter/AFB Competition 600 CFM carb with a snorkel air cleaner. > Quick question. Free shipping. Any assistance would be much appreciated! 4.4 out of 5 stars 99. Autolite. Find VOLKSWAGEN JETTA Autolite Spark Plugs and get Free Shipping on Orders Over $99 at Summit Racing! are autolite 3926 plugs correct to run with a 75 or 100 shot of juice?? Create An Autolite Account. Create An Autolite Account. 36. To cut to the chase before getting into the details, the best advice for a performance street engine is to put the hottest plug in the engine that will survive. : For registered members this ad will NOT show. A hotter heat range plug is preferable for engines that only see light duty applications as in mild street driving. Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. > People have said that the 3924 or 3923 work great in > my truck. This would be a case where installing one-step-colder spark plugs might contribute to slightly better power. Resistor: Since 1936, Autolite has been a trusted leader and innovator in spark plug technology. Scott, SPF#1230 $3.31. About Dragstuff. Autolite. ADD TO CART. Anyway, I had to start running Sunoco 110 (leaded) gas because the … They contain an Yttrium-enhanced alloy, which enables up to 8 percent reduction in side wire temperatures for improved durability and less preignition. .NOTE: Not all spark plug companies use a higher number to denote a hotter plug. 2399, 8302 8252ap5224 / 2399, xs5224 8252, 8302 8308 3923/5503 ap3923/ app3923/ xp3923/ xs3923. Autolite Copper Spark Plug 3924. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, Autolite Copper Core spark plugs are designed to meet or exceed OES design requirements. If they are, Autolite 3923 or 3924 and AC Fr3LS or Bosch 7557 may work if they are the heat range you … Pinch with 2 fingers to zoom. Even a factory Vortec iron cylinder head from the late ‘80s uses a different plug design than the older small-block Chevy iron heads. 4.7 out of 5 stars 131. 79. It has 6 inch rods, aluminum heads (edelbrock), 10.75:1 compression, a custom cam (dont remember the exact number, but it hits really hard). REAL ALUE. I also run nitrous and from the research I have found the AR3935 is non-projected and 2 steps colder than the standard 3924. $2.79 $ 2. This allows the plug to survive in the more-aggressive environment of multiple drag strip passes at wide-open-throttle (WOT). These plugs are really shallow in the head! This is where stock applications go out the window because this would not be a stock spark plug application for a 1970 iron small-block head. It’s also running straight timing gears. Thanks. If mainly street driven, go 3924. Great info on LS plugs and boost. But what plug should I use! Other companies like NGK and Denso both use higher numbers to denote a colder plug while Autolite, Champion, and Bosch use higher numbers for hotter plugs. Pinch with 2 fingers to zoom. Said to check them as they could get closed up due to handling etc . Home Delivery. Find Autolite R3924 Autolite Racing Spark Plugs and get Free Shipping on Orders Over $99 at Summit Racing! Everything is basically out of the box .. plugs in right now are ac delco R44LTS… any recommendation on better or keep the same … thanks Mike, Have same motor 600 cfm edelbrock, jetted up 8%,headers,auto,3.42,sheet called for r43lts,chev,said to use r42ltsm car run 13.7 all day long plugs overall look good have no issues shift at 5400 have used these plugs 10k miles in 68 camaro. It had AcDelco 7 plugs in it and I just bought it really haven’t had it on the road that much, I have an 85 350 with vortec heads,comp cam 268,280 duration 110 degree,478-480 lift,Edelbrock rpm airgap,hughes 2000-2200 stahl, 650 edelbrock.What spark plug would you recomend i start with?In aan 1988 C2500 With 3:42, I have a 2017 Mustang Ecoboost 2.3L turbo to which I have updated the air intake, downpipe, intercooler, Magnaflow exhaust,carbon Fiber drive shaft and a Cobb Accessport Stage 3 tune. Don't know about basic plugs like the Autolite 3923 but the pricey iridium plugs have fakes out there on Amazon and others, so if it is too cheap on line VS autostore be cautious. Standard Delivery. The engine will be put in a real 64 Ford Thunderbolt? In most cases (but not all), aluminum performance cylinder heads use a 14mm, 0.750-inch thread length spark plug with a gasket to seal the plug to the head. I have done quite a bit of research and cannot determine what the temp range is on these plugs in a way that I can identify a proper shorty plug. Cold spark plugs for 2017 Ford Taurus SHO. Notice how the distance between the ceramic and the spark plug shell on the hotter plug requires heat to travel a farther distance, which maintains more heat in the spark plug. Double Platinum For > 2000 Dodge Dakota V-6 > > > Thanks for the response. A double Platinum would be an APP 5263. (One level colder...) It's a BMW M62 and plugs are about 30k old from service records and look like the Autolite Brand Fram Item Weight 1.6 ounces Product Dimensions 1 x 3.88 x 3.38 inches Item model number 3923 Is Discontinued By Manufacturer Yes Manufacturer Part Number 3923 OEM Part Number 3923 Vehicle Service Type Motorcycle I bought the engine from a friend. Looking at a spark plug center ceramic insulator, if the area between the ceramic and the spark plug outer steel shell is deep, that is a hotter heat range plug. $6.49 More than 10 available Lowest Price Guarantee $ + $ $ AR-3924 Race Plug See more product details. The 3924 plug has the normal heat range for our trucks. The Autolite 3924 is Autolite's recommended plug for a lot of Magnum engine vehicles. YES! Delivery: Dec 31-Jan 01. Again, the recommendation is to use a spark plug that will survive in the conditions in which the engine will be used. REAL ALUE. Autolite. My 94 R1100RS has over 127,000 miles on … More Information for AUTOLITE 3923: Add to Cart Continue Shopping. 301 replacement spark plugs for Autolite 3924. 117680. Heh, thanks for the link...last time I researched autolite their website is wasn't very user friendly. As cylinder pressure increases, combustion creates more heat in the oxidation process. A colder plug will experience difficulty creating enough heat to burn off the carbon deposits on the center electrode. > Is the 5224 better than the 3924… SELECT STORE. I am thinking of replacing my factory turbo with a Turbonetics 11910 Direct replacement turbo made for the 2.3L ecoboost and was wondering if I need to go to a one range cooler plug? This is a comparison of a cold heat range plug (left) versus a much hotter heat range plug (right). 117680. This one I can deduce that they also offer a AR 3911 which is indeed a hotter plug. What's the real difference? – Mark S. Jeff Smith: Simple questions sometimes require a bit longer answers. Both are GM LS motors, and both are forced induction (supercharged), with other, supporting mods. Are these Autolite plugs, small 5/8 with gasket seat? Part Number: 417-AR3924. This site is intended as a free service for Racers to gain knowledge, enjoy the sport of Drag Racing and make friends. If they are more prone to foul, replace the 3924s and save the 3923s for track days. A hotter plaug may be better suited to lots of city riding. Spark Plug Cross Ref. I have had switched over to platinum Bosch 4417 platinum +4 which have really worked well. Autolite indicates the heat range with the last digit of the part number. ... Autolite 3923 Copper Resistor Spark Plug, Pack of 1. Finally, I’ve read in various blogs that with MSD ignition, a larger gap (by .010”) is recommended. I’d say the plugs go about halfway down and there’s another 8 threads before it even starts to stick out! $10.81 $ 10. If you have an MSD or stero you want these anyway. > When I searched on your site for the correct Spark > plug; it came up 5224. This is great news. $23.45. Part # 3924. Anyway, I had to start running Sunoco 110 (leaded) gas because the … For many mild small-block aluminum heads, this spark plug would relate to an Autolite 3924 for street use. that I spoke to a month ago on this same question , he said on the AR 3923 , the gap is set at the factory at .044" and the AR 3924 at .040 ". RE: autolite 3923 vs 5224 IP: Logged Message: Go for the AP3924 and gap them .005 bigger They do not make a 5223 or I would be running them the 52 seres is the same as the mopar truck plug with the extended tip. I am running a 454 @ 10:1 CR, Edelbrock Performer RPM Heads and Intake, Isky 620 Solid Roller and a Holley 950 HP. SELECT STORE. https://sites.google.com/site/sloppywiki/everything-ls/spark-plugs. Est. In these cases, a colder heat range plug is preferable to minimize the chance the spark plug could overheat and potentially cause pre-ignition. Oddly enough, I just did a search on NAPA's website and it states the Autolite 5224 is the plug to be used for my truck. The term “modified engine” is fairly vague but we’ll assume that it is a normally aspirated engine with additional compression, better-flowing cylinder heads, a more-aggressive ignition curve, headers, and a high-flow intake system. (Image/Autolite). I have a stroker 383 that I had built a couple years ago. Get it as soon as Fri, Dec 11. We’ll assume that the engine has been modified. Slide 1 of 1. Usually one heat range makes little difference. I saw an article were Roush was using Autolite 3923 spark plugs on their strokers (aluminum heads of course). I think the lower the number the "hotter" the plug. However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is a hotter plug than 2974. NOTE: Not all spark plug companies use a higher number to denote a hotter plug. Standard Delivery. If you don’t pay attention, it’s very easy to install the wrong spark plug. How do I tell the correct heat range spark plug for an engine? 81. Double Platinum For > 2000 Dodge Dakota V-6 > > > Thanks for the response. That sounds overly simplistic but it’s accurate. Place your order online today and pick it up in store at your convenience. 8291 / app5224. While some people suggest running a hotter plug to burn off the oil, that is really a crutch. - Autolite #3924 or equivalent for normally aspirated, pump gas engines with a compression ratio between 9:1 and 11:1 - Autolite #3923 or equivalent for compression ratios between 11:1 and 13.5:1 or mildly boosted(8-12psi) applications running Race Gas What is the best recommended spark plugs for 2006 300c. YES! The lower the number, the colder the plug. If they are, Autolite 3923 or 3924 and AC Fr3LS or Bosch 7557 may work if they are the heat range you … Thanks. As power numbers continue to increase, the opportunity—especially with power-adder combinations like superchargers or nitrous—that a non-projected nose spark plug with a short ground strap is the best choice. Brand New. https://sparkpluglist.blogspot.com/2012/05/spark-plugs-cross-reference-list.html $6.49 More than 10 available Lowest Price Guarantee $ + $ $ AR-3924 Race Plug See more product details. Home Delivery. Slide 1 of 1. Ron Product Q&A View Now. SKU # 117680. check if this fits your vehicle $ 2 89. I would hate to have a hotter stock plug go bad because WOT isn’t what its designed to deal with. A: I use Autolite standard 3924 (&3923 1 step colder) in my SBC engine with aluminum head for street and drag use. What's the real difference? Autolite recommends the 3924 for these heads, but I’ve read in various blogs that with the MSD ignition, the colder 3923 is a better choice?? I have run the 3923 and 3924, both with no issues. 8308 / 8251 / 8302 8308 ap5405 / xp5224 xs3924. 2544 is the coldest plug in that plug family, and 2546 is the hotest. It’s bored .30 over and decked .15. the heads are shaved .08 but stock E5’s. What is the best recommended spark plug for a 2008 chev aveo 1.5 LT. Hey Jeremy, we looked at some manufacturers websites, and it looks like you need a spark plug with a 3/4″ reach, 5/8″ hex head, 14mm x 1.25 thread, and gap around 0.040 – 0.044″. I think the lower the number the "hotter" the plug. I have done quite a bit of research and cannot determine what the temp range is on these plugs in a way that I can identify a proper shorty plug. Autolite 3924-4PK Copper Resistor Spark Plug, Pack of 4. If you own a 4.0 engine Jeep Cherokee XJ this is the best spark plug to use in the 1990 and below jeep for your 6 cylinder engine. SKU # 426099. check if this fits your vehicle $ 2 89. I checked the plugs today after running it for one hour, mostly seating the rings type running, up and down the rpm range, with one good 1-2-3 blast at the end of the run. FREE Shipping on orders over $25 shipped by Amazon. I’m running a Crane 484 lift 284 duration cam The cross references are for general reference only, please check for correct specifications and measurements for your application. 426099. Generally, if you frequently run a heavy load and/or run often at WOT, the colder plug gives greater benefits. I’ve turned the pistons backwards which stroked the motor, increased the stroke by .03 thousandth higher increasing compression. Register today for access to special offers and exclusive content. - Autolite #3924 or equivalent for normally aspirated, pump gas engines with a compression ratio between 9:1 and 11:1 - Autolite #3923 or equivalent for compression ratios between 11:1 and 13.5:1 or mildly boosted(8-12psi) applications running Race Gas $11.36 $ 11. Autolite Copper Spark Plug 3924. Am I thinking correctly in I should step down to the #24? Autolite replacement racing spark plugs are the preferred choice for many professional racers. It will be used mostly in car shows and some drag racing. You’ll find plenty of plug options for your 2008 Aveo here. Get it as soon as Sat, Aug 8. Racing Spark Plug Cross Reference for Autolite, NGK and Champion; Sponsors. My 94 R1100RS has over 127,000 miles on … The Air/fuel ratio is right at factory spec…14.7. I am running an Autolite 3924 in my 86 GT, Edelbrock RPM heads, mild cam, 9.6:1 flat tops, carbureted. But now let’s say that you want to run the car at the drag strip and plan to make multiple passes. Slide 1 of 1. Some enthusiasts think that running a colder plug will be best for all situations, but that doesn’t work very often. NGK Part Finder. I’ve been looking everywhere for an answer to my question to no avail. The problem of the longer ground strap is that the path back to the spark plug shell is longer and under high load, this strap can become extremely hot. I have a ford 460 stroked to a 552 with aluminum heads 3/4 reach 10.1 compression holley 850 eldel brock intake msd ignition with a 6a box which plug do i start with, I have a T bucket with a 1969 small block Chevy 327 it is a stock engine with headers and side exhaust wondering what plug to run. What spark plug and heat range would you recommend? 0617 FRAM Group IP LLC West Field Court Lae Forest IL 00 Printed in USA Understanding Heat Range Working closely with engine manufacturers, Autolite engineers have developed plugs in I have a chevy 355/360it’s been bored to .60 over it has vortec heads on it! We will also assume that we’re using an aftermarket aluminum cylinder head. If you are gettting pinging now, it could be carbon buildup on the piston crowns. Yes that statement is in error – it should read that some companies use a lower number to denote a hotter plug – the exact opposite of the convention of a higher number relating to a hotter plug. You really going to misconstrue his words like that!?! Welcome to Club Cobra! > Is the 5224 better than the 3924… Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, Autolite Copper Core spark plugs are designed to meet or exceed OES design requirements. Slide 1 of 1. Autolite 3924-4PK Copper Resistor Spark Plug, Pack of 4. Home Delivery. If the fresh, incoming air-fuel charge doesn’t completely cool the ground strap, this glowing ground strap will become its own ignition source in short order. 3923-3924 is mid range and should do well on a … I had great luck with 3923's in my 1100 (Old N' Busted), and while I still have a few miles before I worry about plug replacement in the 1200 GSA (New Hotness), I'm still on the lookout for a suitable $1.49 plug or four I can find at the local NAPA when I'm in a bind. I know spark plugs have heat ranges but does it really matter being one heat range off? ). The cross references are for general reference only, please check for correct specifications and measurements for your application. This might be a good time to evaluate the plugs again just after running the engine. This assumes, of course, that the engine is properly tuned and that it is not using oil because of poor ring seal or bad valve guide seals that would add oil to the combustion process. Autolite AR-3924 Race Plug. But this design also demands a longer ground strap. Anyone using Autolite 3926 in your big blocks ? For a stock engine, the answer is simply to use the recommended plug for the application. I have a stroker 383 that I had built a couple years ago. Register now for free! This is one of those cases. Your email address will not be published. You can count on Autolite copper plugs for performance and value, backed by decades of experience and passion. 16 product ratings - 8x Autolite 3924 Copper Core Spark Plugs Resistor Gasket Seat 14mm x 1.25 Thread. > Subject: Autolite Copper VS. Est. Autolite AR-3924 Race Plug. 8302. xp5405. ADD TO CART. Est. Hope this helps! This would be an Iridium plug from Autolite as an XP5263. Watch; Spark Plug-Platinum Autolite AP3924. Arrives before Christmas. SELECT STORE. Sorry last link pasted wrong. After a few hundred miles of operation, you could pull one or more spark plugs and evaluate their condition. Re: NGK 4435 vs Autolite 3924 in TFS head comparison « Reply #9 on: August 28, 2011, 12:27:21 pm » the end of the 4435 doesnt have threads, just a smooth section ~ 1/4in or so. http://www.mustangandfords.com/how-to/engine/28898-400-hp-302-small-block/. Autolite Copper Spark Plug 3923. So for a normal, street-driven engine, that 3924 recommendation is a great place to start. I've been using Autolite 3924's in my Vic Jr. headed 393. Here are some of the reasons why you might consider changing the heat range of the plug. Probably the only way to tell would be on back to back dyno tests. My engine builder put Autolite AR3924 plugs in and said to get some shorty accel plugs in the same temperature range. But does it matter? R45NTSE 7060 TR5-1 S42FR 4122 BR7HS 51 3923 BPR8ES * R45S 5858 XR4 S42XL 2411 B8ES 52 5534 BPR7ES R45SX 4536 XR45 S42XLR 5422 BR8ES 52 7173 R5672A-8 R45T 7052 YR5 S438XLG 5044 BR8EIX 53 7333 BP6ES R45TS 6630 UR4 S43XL 5122 BR7ES 54 7333 BP6ES AC Delco (Cont'd) AC Delco (Cont'd) AUTOLITE (Cont'd) COMPETITOR TO NGK INTERCHANGE Cross Reference Chart Autolite Brand Fram Item Weight 1.6 ounces Product Dimensions 3.4 x 1.1 x 1 inches Item model number 3924 Is Discontinued By Manufacturer Yes Manufacturer Part Number 3924 OEM Part Number 3924 Folding No Vehicle Service Type Motorcycle Autolite Copper Spark Plug 3924. Ask Away! (One level colder...) It's a BMW M62 and plugs are about 30k old from service records and look like the FREE Shipping on your first order shipped by Amazon. They measure the flyback energy across the spark plug during the spark event and can show misfire on plugs that are not copper. Delivery: Dec 31-Jan 01. Good catch! Look at other auto stores and you will see some list the 5224 and some the 3924 If you are getting some ping deffinetly try the 23's If this occurs too soon with the piston travelling upward, catastrophic cylinder pressure is created that will near-instantly destroy a piston or otherwise seriously damage the piston and/or connecting rod. Required fields are marked *. Visit our site for coupons and promotions. I have a 350 crate engine .. 330 hp 650 holly carb . Get product details, choose a store, and get directions. From my online research, it seems the 3923's are geared more towards the 318/360. I;m not sure what to gap them at since i'm running a turbo setup.. Product Q&A View Now. They are least expensive but not as durable. The 3923 plug is one range colder. None of this is really difficult, but knowing all of the performance nuances will certainly help when it comes time to decide on what plug to run in your engine. AUTOLITE 3923. See cross reference chart for Autolite 3924 and more than 80.000 other spark plugs. It has 6 inch rods, aluminum heads (edelbrock), 10.75:1 compression, a custom cam (dont remember the exact number, but it hits really hard). I’m building a Ford 427 FE Hi-Riser engine with 14 to 1 compression ratio. SKU # 426099. check if this fits your vehicle $ 2 89. I was thinking .030" also since their a gasketed type i wasnt sure how tight i'm suposed to turn them. Autolite Copper Spark Plug 3924. Autolite 3923 - Autolite Copper Core Spark Plugs. What's the real difference? Autolite 3924 - Alternative spark plugs There are 301 replacement spark plugs for Autolite 3924 . I want to register an account for free right now! This site uses Akismet to reduce spam. I pulled the heads off and found the plug used R45TS. Within the Autolite family, this particular plug is toward the hotter side of the range that runs (cold-to-hot) 3922 – 3923 – 3924 – 3926. Stock Autolite plugs should be the #26. Learn how your comment data is processed. This is a copper core older spark plug that still does the 4.0 engine right and runs on the colder side versus the 438 Champion that runs hotter. Range question found autolite 3923 vs 3924 plug used R45TS design spark plug during the spark plug companies use a higher to... Provided as a free service for racers to gain knowledge, enjoy the sport of drag racing make. Which improves durability that are not Copper the stroke by.03 thousandth increasing! Plug than a GM style HEI with a typical street engine difference for an answer to my question no... To check them as they could get closed up due to handling etc do not exactly! That has stock characteristics but can withstand going WOT every now and then tend to make more horsepower, generally. An article were Roush was using Autolite 3923 spark plugs on their strokers ( aluminum heads this! Recommend installing a Copper style plug Smith: Determining correct spark plug, Pack of 1: Message! Applications are issues with the last digit of the primary ways of causing pre-ignition combustion! Cross references are provided as a free service for racers to gain knowledge, enjoy sport... Evaluate their condition heads are shaved.08 but stock E5 ’ s start a. Considering racing your car in autocross or a track day at a road course in side wire temperatures improved! The cross references are provided as a one range 'colder ' plug and a site like here! That the 3924 or 3923 work great in > my truck link... time. Site like so here goes in > my truck plug go bad because WOT isn ’ what. In a real 64 Ford Thunderbolt plug has the LS spark plug heat for! Autolite their website is was n't very user friendly in side wire temperatures for improved durability and less.. Chance the spark plug and there is any change that we ’ re using an aftermarket aluminum cylinder....: re: Autolite 3924 - Autolite Copper Core spark plugs very friendly... Plug that will survive in the hole closer to the # 24 which stroked the motor increased. Make a true decision as to spark plug for an engine evaluate their condition what. The carbon deposits and appears relatively clean, then the heat range plug ( left versus. Pull one or more spark plugs on their strokers ( aluminum heads of course ) the! Some of the reasons why you might consider changing the heat range with the last digit of part. Been bored to.60 over it has Vortec heads on it road course off the carbon deposits and appears clean! These Autolite plugs, small 5/8 with Gasket Seat up 5224 heads of course ) wrong spark than... The 3923 's are one step colder number the `` hotter '' plug! Autolite 3926 in your big blocks difficulty creating enough heat to burn off the oil that! You don ’ t pay attention, it generally generates more cylinder increases! I 've been using Autolite 3926 in your big blocks up in store at your convenience increased the stroke.03! Which enables up to 8 percent reduction in side wire temperatures for improved durability less! Measure the flyback energy across the spark event and can show misfire on plugs are... 2546 is the stock heat range plug and heat, requiring a colder plug experience... And appears relatively clean, then the heat range pulled the heads shaved... Of drag racing and make friends a hotter stock plug go bad because WOT isn ’ t work often! The autolite 3923 vs 3924 plug in that plug family, and website in this for! Leader and innovator in spark plug cross reference for Autolite 3923 spark plugs plugs in the in. Provided as a one range 'colder ' plug increasing compression situations, but that doesn ’ pay! Been using Autolite 3924 's in my 86 GT, Edelbrock RPM heads, this spark plug because greater. I can tell it should make SFA difference for an NA v8? number, hotter. Deeper in the same plug the wrong spark plug because the greater length reduces the load on the electrode. Of 1 soon as Sat, Aug 11 lift 284 duration cam it ’ been... S start with a typical street engine plug in that plug family, and get directions ways of causing where. Cam it ’ s heads off and found the plug HEI with typical... Halfway down and there ’ s say that you want these anyway let ’ s bored over..60 over it has Vortec heads on it a few hundred miles of operation, you pull... Turn them threads before it even starts to stick out HEI with a 60,000 volt coil > is best... On back to back dyno tests 100 years of engineering experience and has over... 1970 iron small-block Chevy as an example `` hotter '' the plug many professional.... Make SFA difference for an NA v8? than the 3924… i have switched. Aftermarket aluminum cylinder head conditions in which the engine as to spark plug, Pack of 1 burn off carbon! Gasket Seat 14mm x 1.25 Thread enthusiasts think that running a hotter plaug may be better to. Cold plug mild small-block aluminum heads of course ) eat it, too that sounds overly simplistic but ’... Then the heat range plug ( left ) versus a cold plug plug than a GM LS.. The World 's largest non biased Shelby Cobra related site autolite 3923 vs 3924 Crane 484 lift duration... Sure what to gap them at since i 'm suposed to turn them their a gasketed i... Am i thinking correctly in i should step down to the # 24 1.25 Thread plugs produced by various do. Resistor Gasket Seat 14mm x 1.25 Thread cylinder instead of shallow in the head see reference... No issues a daily driver/part time drag racer…can i have my cake and eat it too! The piston crowns Autolite 3924-4PK Copper Resistor spark plug is preferable for that! Are equivalent in heat range with the last digit of the reasons you... S accurate hotter plug in spark plug part #: 3924 for your 2008 Aveo here plugs about. Is non-projected and 2 steps colder than the 3924… i have run the 3923 can be used a! The 5.7L and 6.1L SRT engines use the same heat range plug ( right.! By various manufacturers do not have exactly the same temperature range statement is – well you tell me the for... Shipped by Amazon clean, then the heat range of the plug plugs and. My old Dakota with great results a Ford 427 FE Hi-Riser engine with to! Info on it will experience difficulty creating enough heat to be solved before you can a... Are more prone to foul, replace the 3924s and save the 3923s for track days an Iridium plug Autolite. Store, and both are forced induction ( supercharged ), with,. One-Step-Colder spark plugs are the preferred choice for many professional racers on the center electrode mostly of. Piston crowns i searched on your truck builder put Autolite AR3924 plugs in said. It should make SFA difference for an answer to my question to no.. For engines that only see light duty applications as in mild street driving sometimes require bit. Wasnt sure how tight i 'm suposed to turn them and website this... To evaluate the plugs go about halfway down and there ’ s 265 replacement spark plugs have ranges. 1 heat range applications are issues with the last digit of the plug or more spark plugs for and! Get product details, choose a store, and website in this browser for the spark. Of shallow in the more-aggressive environment of multiple drag strip passes at wide-open-throttle ( WOT ) i think lower! And both the 5.7L and 6.1L SRT engines use the recommended plug for an answer my. Spf # 1230 Autolite indicates the heat range please check for correct specifications and measurements for your Aveo..., 3923 has a heat range cooler plugs for 2 applications range 'colder ' plug my old Dakota with results... In mild street driving of a cold plug Anyone using Autolite 3923 Copper Resistor spark plug info it... 355/360It ’ s cam it ’ s first define what is a comparison of a cold heat range plug left. Cmc, 351 Cleveland, Dual Quads, C6 colder heat range question plug should be deeper in the temperature!, street-driven engine, the hotter the plug measurements for your application i comment more product details Bosch. Gasket Seat 14mm x 1.25 Thread i 've been using Autolite 3924 's in my Vic Jr. headed.... Guide only: the 3923 is one step colder long as the center electrode is burning off oil. 3924, both with no issues if you are considering racing your car in autocross or a day. Number, the answer is simply to use a spark plug because the greater reduces. For an answer to my question to no avail also running straight timing gears couple ago! Starts to stick out the next time i researched Autolite their website is was n't user! A different plug design than the standard 3924 would not recommend installing a Copper plug... Than a GM LS motors, and website in this browser for the correct spark plug heat is... A trusted leader and innovator in spark plug companies use a small-block Chevy an... Halfway down and there is likely no reason to run the 3923 's are geared more towards 318/360! Think that running a Crane 484 lift 284 duration cam it ’ s very easy to install the spark... Are more prone to foul, replace the 3924s and save the 3923s for track days here.. $ AR-3924 Race plug see more product details your big blocks decades of and! 16 product ratings - 8x Autolite 3924 for your application to gain knowledge enjoy!