Thread: spark plug type
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Old 06-04-2005, 12:28 PM
oldmachdriver oldmachdriver is offline
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Location: ellabell, GA
Cobra Make, Engine: Concept, Boss351
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Default spark plug type
I have a 71 boss 351, with 72 HO heads.

when i pulled the spark plug off it was an autolite AF-42

when i looked up the block and the heads in the haynes book it says supposed to use ARF-42.

I go to the auto zone and they cross reference them and i get the Autolite APP-25 double plat. He tells me thats the type i need for that block and heads.....

the AF-42 is shorter than the APP-25....

my question is did i have the wrong plug from the start?...is it ok to use the APP 25?.......only mods that i know of is TRW flattop pistons. .....
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