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DragStuff Home > Article Index > Racing Spark Plug Cross Reference Chart Autolite / Champion to NGK Autolite Racing AC Delco Champion NGK NGK Stock Number AR12 40TS RV9YC R5674-7 5034 AR13   RV9YC R5674-6 4449  AR23   RV9YC BPR6FS 2623  AR24   RV12YC BPR6FS 2623  AR25   RV15YC4 UR4 6630  AR32   RF9YC AP8FS 2227  AR33   RF9YC AP7FS 2127  AR50   N59YD R5672A-10 3395  AR51 436XLS N61YD,N6YC R5672A-9 7405  AR52 440XLS N63YD,N7YC R5672A-8 7173  AR53   N9YC BP6ES 7333    C44S   R5670-5 2298   44S   R5670-5 2298   45S   R5670-5 2298   46S   R5670-5 2298 AR72   J12YC R5670-7 2891  AR73 R43S,43S J12YC R5670-6 2746  AR74 M43S J12YC R5670-6 2746  AR92   S57YC R5724-10 7993  AR93   S59YC R5724-9 6434  AR94   S61YC R5724-8 4175  AR103   RS9YC BPR6EFS/TR6 3623  –   RF10C AR6FS 3323  AR131   V55C R5673-10 4050  AR132 M90 V57C R5673-9 3442  AR133   V59C R5673-8 3249  AR134 MR41T V63C R5673-8 3249  AR135   V63C R5673-7 4367  –   RV8C R5673-6 4256  –   N3C R5671A-7 4091  AR472   S57C B9EFS 1085  AR473   S59C B9EFS 1085  AR474   S61C B8EFS 1049  AR764   RS12YC TR5 2238  AR2592   C59 R5671A-10 5820  AR2593   C61 R5671A-9 5238  AR2594   N2C B9ES 2611  AR3910   C59YC R5672A-9 7405  AR3911 440XLS C61YC R5672A-8 7173  AR3923   RC9YC BKR6E 6962  AR3924   RC12YC FR5 7373  AR3931   C55C R5671A-11 6596  AR3932 S40XL C57CX R5671A-10 5820  AR3933 S41XL, 436XLS C59CX R5671A-9 5238  AR3934 41XL C61CX R5671A-8 4554  AR3935   C63C R5671A-7 4091  –   L87YC BP6HS 7331              AC Delco to NGK AC DELCO NGK PN NGK Stock Number 42S R5670-6 2746 42TS R5674-6 4449 436T R5673-9 3442 436TS R5674-9 6468 438T R5673-8 3249 438TS R5674-8 5657 438XLS R5672A-8 7173   R5670-6 2746 43TS R5674-6 4449 440T R5673-7 2817       R42S R5670-6 2746 Heat Range Reference NGK Heat Ranges - The larger the number after the dash the colder the plug is. Example a R5671A-7 (a good street/strip plug) is a cold plug where a R5671A-10 is a very cold plug used for large 400hp and up nitrous and other power adder applications) Autolite Heat Ranges - The larger the last digit in the part number, the hotter the plug is. Example a AR3935 (good street/strip plug) is hotter than a AR3932 plug which is very cold used for lots of nitrous. Champion Heat Ranges - Typically Champion numbers in the same series the larger the number the hotter the plug. Additional Spark Plug Related Resources Pro Systems Spark Plug Reading Tool Kit Blown Alcohol Spark Plug Reading 101 Detailed Plug Pictures page Plug reading Discussion going on in our message board Another excellent "How to read Spark Plugs" article Racing Spark Plug Cross Reference for Autolite, NGK and Champion How you can read spark plugs and select them - by Gordon Jennings (Note: Geared towards Motorcycles but very good info here. Make sure and read the part about how detonation makes the plug look cleaner.)     Menu   DragStuff Home   Racing Articles   Drag Racing Message Board   Drag Racing Classifieds DragStuff.com is a service of Beyond Engineering 1007 US Highway 54 West, La Harpe KS 66749 © Copyright 2003 - 2009 - (620) 496-2682 Privacy Policy