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Old 05-15-2005, 10:04 AM
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Default milled head.

does anybody how much compression is raised by shaving the head .20 thousandths? The block was decked only 0.8 and i'm using cp's 9:7.
Old 05-15-2005, 10:22 AM
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Default Re: milled head. (jdmhonda)

.20 or .020
Old 05-15-2005, 11:26 AM
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Default Re: milled head. (jdmhonda)

.20 thousandths=.0002" but I don't think that is what you mean
.8 decked is almost an inch, so I don't think that is right either.
The zeros and decmal points mean everything when doing these calculations.
We would also need to know the bore, stroke and what thickness head gasket you are using.
Old 05-15-2005, 11:32 AM
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Default Re: milled head. (earl)

the head was milled .25 thousanths and its a 81.5 bore with a stock headgasket.
Old 05-15-2005, 02:53 PM
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Default Re: milled head. (jdmhonda)

No it was milled 25 thousandths OR .025"...not .25 thousandths. Big difference
Old 05-15-2005, 02:56 PM
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Default Re: milled head. (earl)

If your motor was really 9.7-1, taking .025" off would raise the c/r to about 10.5-1
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