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Racing Spark Plug Cross Reference Chart


Autolite / Champion to NGK
Autolite Racing
AC Delco
Champion
NGK
NGK Stock Number
AR1240TSRV9YCR5674-75034
AR13 RV9YCR5674-64449 
AR23 RV9YCBPR6FS2623 
AR24 RV12YCBPR6FS2623 
AR25 RV15YC4UR46630 
AR32 RF9YCAP8FS2227 
AR33 RF9YCAP7FS2127 
AR50 N59YDR5672A-103395 
AR51436XLSN61YD,N6YCR5672A-97405 
AR52440XLSN63YD,N7YCR5672A-87173 
AR53 N9YCBP6ES7333 
 C44S R5670-52298
 44S R5670-52298
 45S R5670-52298
 46S R5670-52298
AR72 J12YCR5670-72891 
AR73R43S,43SJ12YCR5670-62746 
AR74M43SJ12YCR5670-62746 
AR92 S57YCR5724-107993 
AR93 S59YCR5724-96434 
AR94 S61YCR5724-84175 
AR103 RS9YCBPR6EFS/TR63623 
 RF10CAR6FS3323 
AR131 V55CR5673-104050 
AR132M90V57CR5673-93442 
AR133 V59CR5673-83249 
AR134MR41TV63CR5673-83249 
AR135 V63CR5673-74367 
 RV8CR5673-64256 
 N3CR5671A-74091 
AR472 S57CB9EFS1085 
AR473 S59CB9EFS1085 
AR474 S61CB8EFS1049 
AR764 RS12YCTR52238 
AR2592 C59R5671A-105820 
AR2593 C61R5671A-95238 
AR2594 N2CB9ES2611 
AR3910 C59YCR5672A-97405 
AR3911440XLSC61YCR5672A-87173 
AR3923 RC9YCBKR6E6962 
AR3924 RC12YCFR57373 
AR3931 C55CR5671A-116596 
AR3932S40XLC57CXR5671A-105820 
AR3933S41XL, 436XLSC59CXR5671A-95238 
AR393441XLC61CXR5671A-84554 
AR3935 C63CR5671A-74091 
 L87YCBP6HS7331 
     

 

AC Delco to NGK
AC
DELCO
NGK
PN
NGK Stock
Number
42SR5670-62746
42TSR5674-64449
436TR5673-93442
436TSR5674-96468
438TR5673-83249
438TSR5674-85657
438XLSR5672A-87173
 R5670-62746
43TSR5674-64449
440TR5673-72817
   
R42SR5670-62746

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

 

 

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