Quote:
Originally Posted by pat in Santa Cruz
don't assume the head is flat. After so long, with signs of over heating ( repaired cracks) and water leakage ( the pitting), odds are it is not. Proper determination is done with a machinists straight edge and a feeler gauge. It does not take more than a few thousandths warp to cause a leak of combustion gases or water. If the gases leak into the water jacket, you will have overheating issues. I prefer to at least skim an old head before installing with a new gasket. As long as you will have the block torn down, a decking would be a good idea too. Both surfaces should be finished with a good roughness average, that is, not be smooth, to grip the gasket. If there is not enough clearance between the piston top and the head from frequent re surfacing, the fly cut can be made deeper, but stock Model A heads are plentiful very inexpensively.
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Good advice. When we rebuild it, I plan on having it surfaced if needed. I only meant that, at least visually, it looked good.