spark plug gap 350
 

whats a good spark plug gap for a gen 1 350 with hei ignition?

i keep getting mixed answers from the internet ranging from .030 to .060

Re: spark plug gap 350
 

With HEI its .045

Re: spark plug gap 350
 

Still the same for a mildly built up motor 0.45? I have a edelbrock rpm intake and and edelbrock 600cfm carb. I know it has a cam in it but I could not tell you what kind. Conpresion is a even 180 across all pistons.
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Re: spark plug gap 350
 

The only thing that matters for the spark plug gap is the ignition system. .045 is where it needs to be for an HEI. Any larger and the coil and module get overworked and a smaller gap will hurt fuel economy.

Re: spark plug gap 350
 

i set mine at .045

Re: spark plug gap 350
 

X3
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Re: spark plug gap 350
 

.045 for HEI.

Learn it, live it, love it... :)

Gary

Re: spark plug gap 350
 

x4

Re: spark plug gap 350
 

R44TS 0.045 gap

Re: spark plug gap 350
 

x6 I run .045 in mine, you can run a little more if you have lower compression (its harder to get a spark at higher cylinder pressures from high compression or boost) or a higher output coil.