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Re: 454 build help
I have only built two 454's so I'm no expert but no good machinist would bore a block without having the pistons in his hand. As for the cast crank I would go with a forged crank and forged pistons if you are going to boast it or use nitrous. Hot Rod magazine built a 509 from a 454 block to 845 HP a few years back and it cost $36,000 in parts and labor. Also your .070 pistons will be harder to find then if you had just went .060 over.
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69 Chevy 4x4 383 Power 
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