The 6X chambers are so deep I would really think they should be fine without any valve reliefs for a mild cam. They are .200 deeper than a RAIV chamber putting the valves that much further from the piston! The valves are in a different location/angle than your earlier ones. It will drop the compression. But they did use them on all the 76 and up 400s.
But a dish and some pocket ported factory heads will work too.Probably just throw some TRW 2262 in a lathe and cut a 2.8 x.100 dish and be fine.Some aftermarket dishes wil be lighter though.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
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