Spark Plug Quick Reference Guide

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quake101:
5.0
Stock E7 heads:
AUTOLITE
stock--stock 25 ( 5 ) [14m, .460 Reach, 5/8" Hex]
1 step colder--24 ( 4 ) [14m, .460 Reach, 5/8" Hex]
2 step colder--23 ( 3 ) [14m, .460 Reach, 5/8" Hex]
-----AR133 ( 3 ) [*recessed tip, racing plug]
-----AR132 ( 2 ) [*recessed tip, racing plug]
-----AR131 ( 1 ) [*recessed tip, racing plug]

NGK
stock--( UR45 ) 6945 ( Heat Range - 4 ) [14m, .460 Reach, 5/8" Hex]
1 step colder--( UR55 ) 2248 ( 5 ) [14m, .460 Reach, 5/8" Hex]
2 step colder--( UR6 ) 7773 ( 6 ) [14m, .460 Reach, 5/8" Hex]
-----( R5673-8 ) 3249 ( 8 ) [*recessed tip, racing plug]
-----( R5673-9 ) 3442 ( 9 ) [*recessed tip, racing plug]
-----( R5673-10 ) 4050 ( 10 ) [*recessed tip, racing plug]


GT40 Heads:
AUTOLITE
stock--765 ( Heat Range - 5 ) [14mm, .708 Reach, 5/8" Hex]
1 step colder--764 ( 4 ) or 104 (4) [14mm, .708 Reach, 5/8" Hex]**
2 step colder--103 ( 3 ) [14mm, .708 Reach, 5/8" Hex]**
-----AR473 ( 3 ) [*recessed tip, racing plug]
-----AR472 ( 2 ) [*recessed tip, racing plug]

**The difference between the 764 plug and the 104/103 plug is the thread. The 764 plug is a half thread whereas the 104/103 plug is a full thread. The full thread plugs are duplicates of the half thread plugs in every other aspect, they both protrude the same amount into the combustion chamber.

NGK
stock--(TR4) 3754 (Heat Range - 4) [14mm, .708 Reach, 5/8" Hex]
1 step colder--( TR55 ) 3951 ( 5 ) [14mm, .708 Reach, 5/8" Hex]
2 step colder--( TR6 ) 4177 ( 6 ) [14mm, .708 Reach, 5/8" Hex]
-----(B8EFS) 1049 ( 8 ) [*recessed tip, racing plug]
-----(B9EFS) 1085 ( 9 ) [*recessed tip, racing plug]

TFS, Edelbrock, and AFR Heads:
[14mm, 3/4" Reach, 5/8" Hex, gasket seat]
AUTOLITE
1 step colder--3924 (4) [*recommended starting point]
2 step colder--3923 ( 3 )
-----AR3933 ( 3 ) [*recessed tip, racing plug]
-----AR3932 ( 2 ) [*recessed tip, racing plug]
-----AR3931 ( 1 ) [*recessed tip, racing plug]

NGK
1 step colder--( FR5 ) 3686 ( 5 ) [*recommended starting point]
2 step colder--( BKR6EY ) 3696 ( 6 )
-----( R5671A-8 ) 4554 ( 8 ) [*recessed tip, racing plug]
-----( R5671A-9 ) 5238 ( 9 ) [*recessed tip, racing plug]
-----( R5671A-10 ) 5820 ( 10 ) [*recessed tip, racing plug]

MOTORCRAFT
1 step colder--AWSF22C
2 step colder--AWSF32C



4.6
MOTORCRAFT
stock--AWSF-32C ( copper )
1 step colder--AWSF-22C ( copper )
2 step colder--AWSFA-12C ( copper )
AGSF-32C--FRPP heads

NGK
stock--TR-55/ 3951
1 step colder--TR-6 4177
1 step colder--NGK TR6
1 step colder--NGK BR6EF (Non-projected, resistor, v-groove copper)
2 step colder--NGK BR7EF (Non-projected, resistor, v-groove copper)
2 step colder--BP7EFS [PN - 3526] BR7EF [PN - 3346]
2.5 step colder--R5724-8 [PN - 7317]
3 step colder--R5724-9 [PN - 7891]
4 step colder--R5724-10 [PN - 7993]

AUTOLITE
stock--764
1 step colder--103
2 step colder--AR94
3 step colder--AR93
4 step colder--AR92

CHAMPION
YS-59C

DENSO
stock--IT16
1 step colder--IT20
2 step colder--IT22
3 step colder--IT24

Dave88LX:
Ew get that code off there and make it regular font. :deal:

quake101:
LOL, There ya go. :)

Bwhitty799:
good stuff

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