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Sorry Jeff, but the place to check P to V is not TDC.
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Absolutely right Andy. That's what I get for answering posts at 7:00am before that first cup of coffee.
I've never even attempted it with the heads on....too much of a chicken. I've always done it by claying the pistons with converted lifters just so that I can section the clay and see where the real problem exists. 'Course mine have always been set up pretty tight since we're trying to get the maximum compression out of the heads. Often times, I end up sacrificing two or three degrees of cam timing just to pick up a much needed 0.030" of PV clearance. I always try to maintain at least .100" on the intake and .125" on the exhaust.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"