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Flatness call out on jug?

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Does anyone happen to know what geometric tolerance for flatness the jug needs to be? Mine is warped and I need to take a few thousandths off. If I were to do that would it have any side effects? Thanks.

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Same as the head, .002".  Removing less then .010 is not going to cause any problems.  It will slightly raise compression and bring the valves closer to the piston and have a very minor affect on valve timing.

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