ACCEL's patented race proven spark plugs in a Shorty configuration. Cold plugs are designed with more contact area, so they transfer more heat away from the tip of the spark 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. If you want to run copper shorty plugs on gt40p heads you need the p526s, $15 each. I quit using Champion plugs in my big block Mopars several years ago and switched to Autolite plugs. Replacing spark plugs can be a simple job, if you take things one step at a time. 3. HEAT RANGE CHART Page 3 of 3 NON- PROJECTED TRUCK PLUG PLUGEZ START STAINLESS TRUCK STEEL 14mm .325" Reach 5/8" Hex Tapered Seat HOT COLD 5847 Look at the first one (left) and notice the difference in thread length between the NGK and the Autolite plugs. The best I've been able to find are the Autolite 3924. NGK nickel spark plugs feature a specially designed v-groove center electrode, improving ignitability and reducing quenching. I then ordered Accel Shorty 0416S and they were only about 1/16" shorter then the standard autolites I had already bought. Autolite offers the X-series of plugs that has slots cut in the end of the plug, creating sharp edges that make it easier for the spark to jump the gap. The Accel plugs seemed too cold on my old combo and wouldn't work with my new heads. The overall length has been reduced 3/16 in to 3/8 in (depending on the specific spark plug) to gain critical air gap between the spark plug boot and the exhaust manifold or header tube. The Autolite is the crossover from a Champion plug, CJ7Y recommended by those who have used it. Autolite AR94 Spark Plugs for 602, 603, 604's (Set of 8) $38.99 Quick View High Velocity Heads. Accels race proven "Shorty" spark plugs are the cure for your "burnt plug boot" blues. The AR 13 plug is the coldest of the three plugs that would replace the R44TS. Couplers Plugs Carburetor and Fuel Pump Adapters Reducers Bulkhead Adapter Fittings Bulkhead Nuts; ... Autolite Spark Plugs. Have never used the Autolite AR plugs, as in racing plugs. They're short like the Accels, have a cut back ground strap, and have a long reach. Reach. The majority of them can last up to 20,000 miles, whereas, high-performance iridium and platinum plugs can run 60,000 miles and even longer. I didn't get to compare them to Accel but they have a lot of room for those tight headers, which was my problem. AUTOLITE COPPER CORE SPARK PLUGSSET OF 8 PART # 3923 * ABOVE PHOTO IS A FILE PHOTO. I cross the heat range. The last number denotes heat range in those racing plugs. To increase the plug gap using a simple gap tool, place the end of the ground electrode in the hole and carefully push down on the end of tool. The plugs I bought per the head dealer were Autolite AR3924. Cold spark plugs are used in most high-performance and high-compression engines, preventing pre-ignition, knocking and other unwanted engine symptoms. I'm thinking of upgrading from autolite 25's to autolite 26's. 1967 Chevelle 496BB/TH400/Strange S-60 (Show and Go) 1967 El Camino 388SB/700R4/12-bolt … 888-800-9629 Live Customer Service * Tech Support Mon-Fri 8am - 5pm PST Autolite Racing Spark Plug. Please update this post if you are able to find another plug the same length as the Accel "header" plugs. NGK racing plugs LOG-IN or SIGN UP ... Autolite. March 2014. $4.95. The accel 'shorty plug' is advertising BS (like most of thier product), they are the same length as autolite race plugs but without the high quality materials of an autolite… Spark Plug Seat Style: Gasket Wrench Diameter: 13/16 in. I use and have for amost 20 years lawn mower plugs in my race and streetcars. I suggest that you do a Google search for Autolite Shorty Spark Plugs. We have dyno proven this plug style and temp range to be perfect for use with our heads … The 98% pure copper core delivers increased heat dissipation for more reliable starts and reduced risk of overheating. Autolite AP605 Platinum Spark Plug. 1.This application listing is to be used as a guide only. Get spark plugs for a mid to late 60's Corvette, I believe the autolite number is AP 144 or APP 144. On 383/400 /440 mopars it is also a big problem and this solves it. To start off our list, we’ve opted for this fantastic spark plug by Autolite that does everything you need it to for an affordable price; perfect for budget-conscious buyers who don’t want to compromise on quality and performance. Click to expand... just got me 8...$40 for 8 at summit.Kragen wants $5.99 each . Racing Spark Plug Cross Reference for Autolite, NGK and Champion These were to long for two of the locations. This helps eliminate burning the spark plug boot or dimpling the header tube. S. I can fit my finger in between the NGK plug and my summit headers (1-5/8" primaries). 2544 is the coldest plug in that plug family, and 2546 is the hotest. The overall length has been reduced 1/4" to 3/8" to gain critical air gap space between the spark plug boot and the exhaust header tube. NGK racing spark plugs are built to withstand the severe mechanical and thermal shock associated with high-revving, high-compression engines. $4.95. Autolite highly recommends that you consult with your vehicle’s owner’s manual for any specific instructions for changing the spark plugs. Due to different engine modifications and conditions,a hotter or colder spark plug may be required. also CJ7 or CJ6. 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. A sbchevy with double or triple bump heads uses CJ8 I … Spark plug 411 - Technical spark plug info - Autolite. Autolite has 2544, 2545 and 2546 available. These autolite ar 103's are shorter than a conventional plug and a good alternative to the accel shorty plugs. Reply. This helps eliminate burning the spark plug boot or dimpling the header tube. Autolite Racing Spark Plug. Autolite 2974 or 2976 is what i use . Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Reach. These instructions should be considered for general guidance only. Them accel shorty plugs are nice!!! Modern-day spark plugs have a long lifespan. For example, take the 254x plug series. Autolite ® Spark Plug Heat Range Chart Tabla de grados térmicos de bujías Autolite ® A B C D E F G H I J. THREAD IRIDIum XP Vortec heads use a .750 reach plug. 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. It also is a cross for the NGK BPM6A, the short version of the plug many of us use. These hot spark plugs are designed to reduce heat transfer and keep the tip of the spark plug insulated. The new cars definitely don't like non resister plugs. 14mm Thread, 0.460 in. I'm now running the Autolite AR series plugs (AR132's). Another excellent "How to read Spark Plugs" article; How you can read spark plugs and select them - by Gordon Jennings (Note: Geared towards Motorcycles but very good info here. They are non resister plugs, may cause interference in your sound system and possibly the ECM. The run of the mill NGK plugs that cross from the 414s, 3924, and RC12YC are a bit longer. These plugs are very short. That takes you to a site that might be able to answer your questions. Autolite Racing Spark Plug. They can also be used for many other cylinder heads that require a plug of this thread depth. Spark Plugs For Vortec Heads: 5613611 R44LTS, set of 8 5614210 MR43LTS, set of 8 25164641 #3, Rapid Fire style, set of 8 P526S Accel U-Groove “SHORTY” Double Platinum Header Plugs approximately 3/16" shorter then R44LTS plugs, set of 8 RS12YC Champion Autolite 104 or 26 ACCEL 516 Bosch HR10B or HR10BX, HR9DC For example, take the 254x plug series. NGK's are shorter than say champion or AC delco. Autolite has 2544, 2545 and 2546 available. You'll need to cross reference for you application. The reach on those is not the explorer's .708. 1967 Nova---LS3/4L70e 1970 c10—LSx/4L60e. The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. Conversely, hot spark plugs are recommended for vehicles that are driven slower and for shorter distances. NGK 2771 plugs are 1/4" shorter than AC Delco R44T and a little more than a 1/4" shorter than Autolite 25 series plugs. Thread reach does … https://sparkpluglist.blogspot.com/2012/05/spark-plugs-cross-reference-list.html Brand:Autolite Product Line:Fram Autolite Racing Spark Plugs Part Type:Spark Plugs Shorty Spark Plug: No Resistor: No Electrode Core Material: Copper Electrode Tip Material: Chromium nickel alloy Insulator Type: Projected Spark Plug Thread Size: 14mm Spark Plug Reach: 0.750 in. a little pricey but definitely the shortest plug. 14mm Thread, 0.460 in. You looked up a 93 mustang 5.0, not the same heads as an explorer, or else we wouldnt even have these problems. Engines can vary widely by make and model. YOU WILL RECEIVE 8 OF PART #AUTOLITE 3923These are the spark plugs we strongly recommend for our NKB and Procomp heads. Bosch plugs are of the shorter design too and way cheaper! Hope this helps Make sure and read the part about how detonation makes the plug look cleaner.) AutoliteSparkPlugs.com is part of the SparkPlugs.com family, an authorized Autolite dealer. Save Share. Or SIGN up... 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