Quote:
Originally Posted by enaberif
Spark plug gap on a HEI Chevy should be .045 as .030 was for a points system. Yes using the wrong gap will make a vehicle run like absolute crap. When I put plugs in my truck they were gapped for .030 and I could not get it to run properly no matter what.
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interesting, we are going to try all on .040 as per the GM Performance Spec sheet, but may bump it up to .045 as you recommend if needed
Quote:
Originally Posted by enaberif
Also doing vac gauge measurements I am pretty sure it should be on manifold vacuum not ported vacuum as should your distributors vacuum advance to get optimal performance.
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it is