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Low compression in a head after being planed and having the valves redone could be caused by improper sealing of the valves, which may not fully seat due to incorrect adjustment or damage. Additionally, the head gasket may not be sealing properly, or the planing process could have removed too much material, affecting the head's ability to maintain compression. Lastly, worn piston rings or cylinder walls could also contribute to low compression, regardless of the head work done.

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1w ago

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