Quote:
Originally Posted by PunchT37
#4`s. Use the smallest chamber then, dish the piston, if necessary to get your static compression. The smaller chamber head has a longer "short turn" and it unshrouds the valves for better breathing.
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The only difference I noted was the -4 chamber is smaller diameter not a different depth. Mine were 93cc untouched. I smoothed the chamber ridge and milled them 0.050 and they were still 93cc. My 78's original -8s are 97.5cc.
I have a set of ported -8s they smoothed the ridge on that go 105cc.
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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 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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