Third Generation F-Body Message Boards - proper spark plug gap for hei?

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evilemokid94

04-10-2013 10:58 PM

proper spark plug gap for hei?

What's the proper gap for plugs in a 96 l31 350 with stock vortec heads, gm hei, and a carb? Right now I have them set to the factory block setting of .60, but I've been seeing that .45 is enough for hei. Help? Opinions? Is .60 too much or just right?

Tuned Performance

04-10-2013 11:09 PM

Re: proper spark plug gap for hei?

.035 to .045

evilemokid94

04-10-2013 11:22 PM

Re: proper spark plug gap for hei?

What determines where it gets set

Tuned Performance

04-10-2013 11:25 PM

Re: proper spark plug gap for hei?

A stock hei puts out up to 45kv , there is no need to run a larger gap and over work the coil. This is not a real high compression engine. Run .035 and you will be fine.

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