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how much horsepower for a 400 sbc

1K views 2 replies 3 participants last post by  FEDDO 
#1 ·
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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