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Old 01-09-2018, 04:26 PM   #2
SilverMiner
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Join Date: Oct 2005
Location: North Idaho
Posts: 335
Re: 400/406/409 Head suggestions

Here is what I'm considering purchasing:

Dart Iron Eagle S/S Cylinder Heads 10024360A
76cc chamber with 165cc intake runners

Cometic MLS Head Gaskets C5248-027
4.165 bore and 0.027 compressed thickness

Using Summit's compression calculator, this puts me right at 9:1.
But is it reliable to use the thinnest head gasket available? Are there any risks?
An alternative would be a 72cc head with 0.036 gaskets - better, or not?
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1980 K10 Suburban Silverado, original 350 w/Qjet swapped to 406sb, TH350C swapped to TH400/205
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