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Most 350 heads had 64cc combustion chambers. On pre-86 307's, it would bump you up to 8.2 (from 8.0:1). post-85 307's it would get you 8.4:1. On post 85 307's you'd have to change your intake to either the 350 intake or an A4 aluminum. The ports are tiny on post-85 A5 intakes.

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Q: Does the Oldsmobile 350 heads add more compression to the Oldsmobile 307 motor?
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