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Old 03-11-2012, 11:41 PM
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Gap tolerance on a pre 80's chevy 350

I have a 72 chevy 350 from a c- 10 in a 78 firebird. I bought spark plugs for it and the parts store told me to gap them at .035. I pulled the old plugs out and all of them were gapped at .045. What is with the difference? I dont know what was done to the motor other then what I see. Edelbrock 600 cfm carb. Edelbrock performance rpm intake. Hooker headers. 8.8mm spark plug wires. It seems like it ran better with the .045 gap plugs. Any help?

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Old 03-12-2012, 01:16 AM
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Plug gap is not nearly important as it's made out to be. In the old days with points ignitions the gaps were set close. When the HEI came out gaps started getting wider. If to you it ran better with a certain gap go back to that.
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Old 03-12-2012, 01:36 AM
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Gap tolerance on a pre 80's chevy 350

Double vision. Thank you. Thats twice you helped me out. Can I email you pictures of the motor and maybe you can answer a few more question for me so I dont have to keep posting. My email is addictivewoodworks@yahoo.com. I havent built a motor in 16 years. I forgot so much...
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