Thread: Rocker Arms/ Valve Lift question: will it clear?

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Depending on too many variables here. Dig through the kid's toybox and score some modelling clay. Clay the piston and drop the head on with a used head gasket or a double thickness of coke carton to get aprx .041" and rotate the engine through a couple of revolutions. Make sure the head bolts are only indexing the heads and not tight. If you feel resistance, stop and back up. In any case, pull the head and cut the clay through the valve impressions and whip out your verynear calipers for a reading. If you are in the neighborhood of .100" exhaust and .080" intake, that is where you want to be. Stay on the plus side since your lifters are going to pump up a tad bit and add a shade more lift.

Don't get all logical and assume that you check this at TDC because that does not take into account how you indexed your cam.