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yeah they are basically the same outside but completely incompatible otherwise. Another option for the older blocks is retrofit lifter kits. That way you can run a roller cam in a flat tappet block. They are pricey though, better to look for an 87 and newer car block.
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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