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- - Spark plugs (https://forums.maxperformanceinc.com/forums/showthread.php?t=803711)

mkeafer

04-08-2017 06:54 PM

Spark plugs

Hey gang:
I have a 64 cat with a 65 389 engine with a GM HEI distributor. It works great! However, I am not sure what gap I should use on the spark plugs. I feel sure it would be different that what is called for for the original ignition system. Any ideas? If this has been answered before I apologize for the inconvenience.
Thanks in advance.
Mike.

Bill Hanlon

04-08-2017 10:31 PM

My '57 GMC (Pontiac) V8 with a '77 HEI was happy with AC 45 plugs gapped at 0.050"

Goatracer1

04-09-2017 10:50 PM

I used AC45XS (used in Olds) gapped at .060".

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