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Old 06-26-2011, 06:42 PM
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spark plug gap 327 hei

i asked three people this question and got three answers.
i have a 68 chevy 327 rebuilt, mild cam good stock heads. hei distributor from a mid 80's chevy truck and an edlebrock performer manifold and 1405 carb. what should i run for a plug gap? so far i've been told 35,45 and 60 im thinking 35 but figured i would check in here.

thanks for taking time to read and respond.

oh and this is all wrapped up in a 66 impala

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Old 06-26-2011, 06:52 PM
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I have a 327 with HEI and am running .045 gap on the plugs that are were designed for early HEI system. Don't remember which AC plugs they are, but they have been in the motor for over 40,000 miles and still looked great about a year ago.

Trees
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Old 06-26-2011, 08:05 PM
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with this 327 are you using , the old style heads with the large spark plugs, if you are these spark plugs were designed for a gap of .035 tho . I would'nt go any more than .040 tho and use AC Delco spark plugs in your Chevy.
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Old 06-26-2011, 09:08 PM
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thanks guys, the heads are from 1970 i dont have the casting numbers handy but i know they were good heads and they are the big plugs. but again my memory is failing me on the number, but they are ac delco plugs
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