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15 Ali rolled the motor over until the exhaust valve just started to open. Then he set the intake lash. With that done, he rolled the 350 over some more until the intake opened and started to close. Right before the intake was closed he stopped and set the lash on the exhaust. This will ensure the valve you are adjusting is on the base circle of the cam. For our Isky Z-30 camshaft, a cold lash setting of 0.032 is recommended so that’s what we set them to. This seems a bit excessive so we may go back after and tighten them up a bit. Without pulling the heads to confirm our piston-to-valve clearance, we could induce piston to valve contact doing this, especially since the rocker ratio has been upped from 1.5 to 1.6.