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Old 01-20-2013, 11:58 PM
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WDCreech WDCreech is offline
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Originally Posted by cadillacdave1 View Post
The original factory motor 289 2v had 10.75:1 compression. Check what the stock cc of the heads were vs the cc of the heads you just put on. Then use a compression calculator, you can find online. I hope this helps.
Pontiac never produced a 289, and you can't go by the factory advertised compression ratios.
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