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You have to find a 283 SBC and bore it .125 over, you must find the 283's with thicker walls to allow for a 4" stroke, the later models arent think enough for that size bore. Next you need a 327 small journal crankshaft, with 11:1 pistons. A solid roller cam because a hydraulic cam with float at 8k rpm and crush a rod. Im not a pro, im building one myself but thats just how my dad and his friends built them back in the day, hot rodders were doing it way before chevy manufactured the dz302 they saw people doing it and figured theyd add an extra cube.

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11y ago
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Q: How do you build a 301 Chevy motior?
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