If the heat range is too cold, the deposits will not burn off the tip and the spark plug will foul. Part# NGK STK # NGK # Comp. 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. AUTOLITE 3924. I'm using the plugs recommended by my head manufacturer (AFR recommends "Plug starting range = Autolite 3924"). ITEM #AUT3924. Also do I use anti-seize? Should I just stick to a stock gap? Heat range is the measure of how fast the spark plug tip dissipates heat. $4.42 Autolite AR3924 Racing Spark Plug - Same Day Shipping. Weight. They list the 3926 for use with engines that have less then 9:1 compression. Are those bosches you have platinum? Compare ... Heat Range 3; Torque Specs Cast Iron: 26-29 lb. Autolite has 2544, 2545 and 2546 available. should I gap them the same as regular 3924… 3925 is about the stock heat range.. 3924 is one range colder. Guaranteed lowest price! You can count on Autolite copper plugs for performance and value, backed by decades of experience and passion. Much appreciated. If the spark plug heat range is too hot, pre-ignition can occur. The parts counter person sold you a plug that is one heat ranger hotter than stock. Fram Autolite AP3924-4PK Platinum Spark Plug, Pack of 4 ... these exact same plugs and heat range are available nickel plated for the same price. 888-800-9629 NOTE: Not all spark plug companies use a higher number to denote a hotter plug. I would return those plugs and … Overall, they look identical, same center electrode diameter,same porcelen diameter, etc etc. Shop for Autolite Copper Spark Plug 3924 with confidence at AutoZone.com. Spark plug gap should be determined by your ignition system manufacturer for best results. cause platinum is garbage. Autolite 3925's are stock temp, 24's are one heat range colder and 23's are two heat ranges colder. Parts are just part of what we do. The '4' on the end of the Autolite part number is the temp range. What are the heat range part numbers for Autolite plugs? Free Returns. NGK Heat Ranges - The larger the number after the dash the colder the plug is. I don't think changing will make a … I ran a 3923 in my old 460ci engine with the Canfield heads … Resistor: Since 1936, Autolite has been a trusted leader and innovator in spark plug technology. 2544 is the coldest plug in that plug family, and 2546 is the hotest. I am running an Autolite 3924 in my 86 GT, Edelbrock RPM heads, mild cam, 9.6:1 flat tops, carbureted. Re: Autolite 3924 alternatives. Post by Walter R. Malik » Fri Aug 21, 2020 5:25 pm Bill Chase wrote: ↑ Fri Aug 21, 2020 12:30 pm I have 2 cylinders that are very close to touching the primary tubes on this 383 sbc, does anyone make a header plug with the same heat range of the 3924 plug? 206 replacement spark plugs for Autolite APP3924. Est. Find Autolite Spark Plugs 4 Manufacturer Heat Range, 14mm Spark Plug Thread Size and get Free Shipping on Orders Over $99 at Summit Racing! Spark Plug Heat Ranges & … Buy Autolite AR3924 at JEGS: Autolite AR-3924 Race Plug. Autolite 3924 Nickel Spark Plug. If you have an MSD or stero you want these anyway. See cross reference chart for Autolite APP3924 and more than 80.000 other spark plugs. BRAND AUTOLITE . Part# NGK STK # NGK # Comp. Do I need to be concerned with the heat range of my spark plugs? PayPal Accepted. They contain an Yttrium-enhanced alloy, which enables up to 8 percent reduction in side wire temperatures for improved durability and less preignition. Autolite replacement racing spark plugs are the preferred choice for many professional racers. SKU # 117680. Autolite 3924-4PK Copper Resistor Spark Plug, Pack of 4 4.6 out of 5 stars 109. Reach, Projected Tip, Non-resistor, Each Part Number: ATL-XP104 Comment Report abuse. Autolite Forced Induction and N/A Autolite 3924's Naturally Aspirated Only Autolite 3923’s 1 Heat Range Colder, good for approx 550rwhp Autolite 3922’s 2 Heat Ranges Colder, good for approx 650rwhp For up to 10.5:1 compression, they list the 3924. 3923-3924 is mid range and should do well on a dual purpose car. Autolite 3924 Nickel Spark Plug SKU #3924. I … Fast delivery Autolite XP104 - Autolite XP Xtreme Performance Spark Plugs Spark Plug, XP, Copper Core, Tapered Seat, 14mm Thread, 0.708 in. $10.14. Refer to recommendation section for specific engine applications Comp. 1969. 12 Yatala Road Mt Kuring-Gai NSW 2080 Open 24x7 - Same Day Shipping! So 4 is a notch or two colder than stock. Tuning and application/usage significantly influence the necessary heat range for optimal performance. Find Autolite Spark Plugs with 5 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! Save $10 off $299, $20 off $599, $30 off $799, $100 off $1,599 Orders - Promo Code: BUYNOW exclusions apply. I have a MSD 6AL ignition. Usually the head manufacturer will provide a baseline recommendation for a plug, but compression and other things factor into what heat range plug will be required for a given application. Manufacturer Heat Range Number: 300: Package Quantity: 1: Resistor: Yes: Read More. - 3/4" reach, 14mm, gasket seat - Autolite #3924 or equivalent for normally aspirated, pump gas engines with a compression ratio between 9:1 and 11:1 But if Autolite AR 3924 is same heat range as 3924, the corresponding NGK racing plug part number seems to suggest it is a heat range 5. R5671–A9 Stock Number 5238, for 18+psi, 2 heat ranges colder 650+ rwhp R5671–A10 Stock Number 5820, for race cars. 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. Any special torque spec or just tight? Pulstar heat range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16. The man at the parts counter looked the the cross-reference and said these NGK's are the same heat range as the Autolite 3924's, and they were only .20 more per plug. So ultimately it … I have a set of AFR 210 cylinder heads and AFR recommends starting with AR3910 Autolite plugs. ft. Aluminum: 15-22 lb. As this is a starting range, I don't know if I would do better with a colder or hotter plug. Find Autolite R3924 Autolite Racing Spark Plugs and get Free Shipping on Orders Over $99 at Summit Racing! For many mild small-block aluminum heads, this spark plug would relate to an Autolite 3924 for street use. of the spark plug. I have a N/A H/C/I combo with AFR 165's and they recommend Autolite 3924 plugs, but they don't give any tips on plug gaps. Chart is for racing plugs, so not a direct equivalent to NGK street plug part number. Helpful. same heat range. At this time the colder Pulstar heat range 2 is available in 3 designs, BE-2HT8 and HE-2HT10 and SE-2T8. Secure Online Ordering. What plug is better? Even though the driving characteristics in a specific engine can vary, a spark plug must stay cool enough to avoid pre-ignition. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). Paul, I'm a fan of autolites, they're cheap and get the job done well. Get yours online today and pick up in store. I know that the straps are back cut on the AR3924's but is that the only difference? Part# NGK STK # NGK # 44 3510 B6S 41-963 7740 PTR5C-13 45FFS 6222 BPR5HS 45 3210 B4 41-965 2467 PTR5A-13 45L 3112 B4L 46 3210 B4 41-974 7862 PZTR5A-15 45NS 7832 BP5ES Not intimately familiar with the Accell numbering scheme, but you should probably be able to figure out which one would be close in terms of heat range, given that info. Heat Range Reference. Thanks, Joe. However, the spark plug must also run hot enough to burn … Autolite 3923 Nickel Spark Plug Replacement Information AutoliteSparkPlugs.com is part of the SparkPlugs.com family, an authorized Autolite dealer. A "stock heat range" plug would be a 5 or 6 (higher is hotter). A switch in heat range of the spark plug will change the tem-perature of the spark plug tip by 70-120 degrees. Tema Pty Ltd. Ph: (02) 9457 0060 Unit 10, No. Autolite spark plug heat range is generally indicated by the last digit of the part number. Part # 3924. Let me know what you would recommend. Amazon Customer. Read more. They emailed me back with a spark plug application chart. Within the Autolite family, this particular plug is toward the hotter side of the range that runs (cold-to-hot) 3922 – 3923 – 3924 – 3926. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. Can anyone find any info on these? I just ordered autolite plugs for tfs heads and summit sent me AR3924 and I need to know if these are the same thread length as the regular 3924's? Pulstar heat range 2 is comparable to NGK heat ranges 8-9, Denso heat ranges 24-27 and Champion heat ranges 4-6/59-63. I just emailed Edelbrock the other day to ask the same question. 5.0 out of 5 stars Spark plugs work well. ft. Part Information; Brand Autolite; Warranty 2 Years; Longevity 30k Miles; Fitment. For example, take the 254x plug series. So not a direct equivalent to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges and... Less then 9:1 compression mild cam, 9.6:1 flat tops, carbureted dissipates heat you have an MSD stero... 3924 for street use system manufacturer for best results a set of AFR 210 cylinder and. Note: not all spark plug - same Day Shipping … same heat range of spark.: 26-29 lb companies use a higher Number to denote a hotter plug Denso heat ranges and! 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