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Discussion Starter #1
I got a E88 head from a guy and he said he had shaved it:

1. How can one tell how much was taken off, where should I take my measurements from, and what is stock?

2. What kinds of compression would I be getting with a F54 block stock bore just rehoning bore for rebuild?

3. Is there a general approximate amount of hp or torque gaine per compression raised, example 9:1 raised to 10:1?

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Re: Check this link

You will get approx. 3 to 4% HP gain when you go from 9 to 10 to one.
The higher the compression ratio the lower percentage gain in HP when you increase the ratio.
 

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3-4% gain

That's not much gain. Also don't you have to use higher octane fuel to avoid detonation? I sounds like increasing the compression ratio would only be worth bothering with if combined with headers and a cam and maybe polishing the ports?
SoM
 
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