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#1
04-08-2017, 06:54 PM
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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. |
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#2
04-08-2017, 10:31 PM
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My '57 GMC (Pontiac) V8 with a '77 HEI was happy with AC 45 plugs gapped at 0.050"
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
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#3
04-09-2017, 10:50 PM
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I used AC45XS (used in Olds) gapped at .060".
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