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Old 09-26-2008, 06:37 AM
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Opinions on proper Plugs for SBC with aluminum heads

383 Stroker
-5cc flat top pistons
w/ 64CC heads (pro comp aluminum) estimated compression from Eagle (bottom end) is 10.7:1

I think (??) the recommended plugs for the aluminum heads are Champion RC12YC (Autolite 3924); however the current plugs are a hotter plug Champion RC14YC (Autolite 3926). These plugs are a gasketed, .750" reach plug. Should I be running the cooler "recommended" plug for this setup ? Thanks.

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Old 09-26-2008, 07:09 AM
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The plugs are little too hot for your compression. I'd go with RC8YC or RC10YC.
The Autolite 3923 to 3924 is better heat range over the Champion.
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