One of my local Houston friends had 614 RAIV untouched heads on a 428 in a 70 Trans Am 4 speed with an Ultadyne 288.296 HFT form Butler that ran high 12s easily but broke Muncies!
FWIW a RAIV head 428 type motor(400 block 4" stroke crank) is my plan for my 65 GTO.
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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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