General Chat About Engine Build
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- Posts: 2
- Joined: Wed May 27, 2020 7:19 am
Hi , i am rebuilding a 3.9 engine with a mild cam upgrade and was thinking which heads would give me some slight performance improvements,I have some slightly ported 3.5 heads some 4.6 standard heads and some standard 3.9 heads .Which do you think I should fit , regards David.