Beachcomberbrian
Member
- Joined
- Apr 19, 2017
- Messages
- 14
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I need some help. I’m currently having my 509 bbc twin engines rebuilt. I’m looking to make close to 700hp out of them on a stock GM bottom end. I’m thinking with those numbers I should switch the rods to H beams? Stock GM are I beam. Also looking for advice on a good head and cam package that can make that power. Advice on pistons? Stock Piston compression is 9.6:1. Should I put domes in it and raise the compression? Thanks in advance for any help. I’ve found some good combinations from old hot rod magazine 502 builds but wondering if there’s any major difference when building power for a street car vs a marine engine.