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Reply to "Mysterious ‘China-wall’ gap"

valve cover rail height is inconsequential,

measure from the dowel hole (zero point on the print) to the intake face, and add 1/2 the diameter of the dowel hole to the 'from' measurement. measure the dowel hole of each head and compute as they may be slightly different

again, with one of each head on the block, set an intake on and the difference will be crystal clear
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