The heads definitely hold them back with those siamesed intake ports. New heads then you have to find a short deck intake manifold or have one made like Tom S did on his short deck project.
Just saw the 69 390 mach 1 in your signature. High school best friend's older brother had a 4 speed one. We could never figure out how to change those spark plugs on the middle cylinders! It was a nice car A blue that was so faint it was almost white. Maybe Dresden Blue.
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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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