Not trying to make life harder for anyone, but going from the the exhaust valve hitting the piston (as reported) to .090" clearance with 4 degrees of retard is not making sense. I suspect that the lifters were either pumped up before (giving less clearance that in actual running) or they are collapsed now (showing less clearance than they will actually have running), or both. I could be wrong, but I question the test setup and what the lifters are doing here. Going from lifters pumped up to collapsed will change the valve opening by as much as .200".
