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How Much do i shave off the head?

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Im getting my head ported and polished and i want to shave the head to increase compression a little bit. Im not to sure to waht ratio, but almost to the amount a high compression piston would add. How much do I take off the head? About what ratio will it give me? Thanks

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What type porting are you having done? Polishing :)

If you can afford the cost of porting buy the correct piston. You can probably remove a few thousands off the head or cylinder but any more will only make the timing chain longer and/or move the valves closer to the piston.

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It will also retard your cam timing, taking away low end. If you want compression buy a piston.

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I had .010 shave off the base of my jug I don't think you want to shave the head :)

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