OK, a simple way to check with engine together & in the car, if it's a
symetrical lobe cam...
Set #4 (6) inlet & exhaust valve clearance to a big number, .050-.060 is
enough for most profiles. It doesn't matter what the number is, it just has to
be accurate, make sure it's right on the base circle when you set it. Then
turn the engine by hand until the #1 cylinder is at TDC on the combustion
stroke. At that point the #4 (6) exhaust is on the closing ramp & the inlet is
opening & if the cam is set straight up, no advance/retard, the clearance on
#4
(6) valves will be equal. If not, just turn crank slightly until clearance is
equal & note variation from TDC.
Glen
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