i installed a used set of et heads that were sent back to etp for reconditioning because the original owner had a ptv problem and caused damage to the head, i am running these heads with a comp grind 231/235,615/621,111+4 cam, the heads are milled .030", when i try to set these heads up i did not check ptv clearance because when i ordered my cam from this shop in florida i wont name, he assured me that ptv would not be an issue with my setup, he also told me to use 8.1 pushrods that they sold me, after wondering why i could not set up my valvetrain correctly i noticed that my intake valve sits .050" higher than my exhaust valve, it is the same on all cylinders, now after seeing this and realizing i will need two different length pushrods, now wont that cause the exhaust valve to make contact with the piston if it is sitting .050 lower than the intake valve with this cam .