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!!!
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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