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Block would need to be sleeved for 1000hp.
4 bolt heads are fine if setup properly. There are plenty of cars running 1100-1300hp with 4 bolt heads. Just need the crazy expensive ARP bigger ARP studs. 1/2" L19 studs will hold 1000hp easily with a thicker deck aftermarket head.
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Nick
Corvette Z06 -1200ish rwhp
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