Because of radial issues plus the tightest spots being about 10* before and after TDC, is why I always do the dough thingiebob? Slice the squashed model clay with a razor knife and see the clearance------will also show the squash areas around the dome to chamber and spark plug--------do it and diassemeble , and measure without being disrupped by wife, friends, mowing yard or playing golf with bama---------

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