The 6X and 5C heads are a pretty good street head. They have the screw in studs and large intake valves. There are two combustion chamber sizes. You should probably try to find the the ones that have a 4 stamped on a small machined pad above the exhaust ports. These have a combustion chamber volume of approximately 92-94 cc's. The ones with an 8 stamped in the same place have a combustion chamber volume of approximately 101 cc's
HTH
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North Dakotas fastest REAL GTO
10.10 @ 131 MPH in the 1/4
Hoping to get it back together some year.
www.jandjrepairandrestoration
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