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Old 04-07-2012, 07:46 PM
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Help with spark plugs and heads 383 stroker.

I am having issues trying to decide what plugs to put in this motor. I have a partial build sheet, but think I am missing something to determine this. Per build sheet this is what I know. 383 2-bolt chevy motor bored .030 over, forged TRW piston, rods 5.7 chevy, comp cam tappet lift 286, duration at .050 236 which is the important #? Heads are 76cc 202/160 valves, this is all I have at the moment. I dont know what the compression ratio is, and how do you know what plugs to use with these heads, is there another # on the heads I need to find? Right now it has Autolite 26, dont know if these are correct. Thanks.

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Old 04-07-2012, 10:20 PM
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If you have flat top pistons with valve reliefs, .025 in the hole, .041 gasket with 76cc heads your c.r. is about 9.07:1. Have you read your plugs correctly to see how they're performing?
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Old 04-09-2012, 07:39 AM
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The plugs are bad, running very rich I have to adjust the carb. and possible new manifold. But how do you know if you should have extended tip or not? Where are the #s on the head located to determine this.
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