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Old 03-12-2006, 09:18 PM
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how much horsepower for a 400 sbc

i have a 71' 4-bolt main 400 with GM performance billet splayed main caps. what would you rate the horsepower limit at. i figured 650 at least with a 3.875 stroke and stock 2.65 main journal size. any info would be helpful. thank you!!!

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Old 03-12-2006, 11:15 PM
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I wouldn't go over 500 horse with a factory block. You could run a fill and a super dooper cooling system and push out about 600 I'd think.

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Old 03-13-2006, 09:27 AM
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hp

many things come into play. more info than you are giving. I ran a splayed cap 400, with block filled and its still running. made 685 dyno hp.has been freshened once close to 400 runs.
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