Guys two of us here that have had first hand experience say lets get it back to his question and stay with IA blocks. No cheerleading either!
Aftermarket blocks are a new deal for alot of us in the Pontiac community-old hat for many Chevy guys. There is a little learning curve but a good machinist can help figure them out.
Even different AN pipe fittings in the same brand fit differently in the same tapped hole sometimes.
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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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