Hello all, I have a question about setting the end play on a cam in a 502. I bought a 502 that Im dropping in a '66 hallett flat bottom. The motor has a large solid roller cam in it. It also has the manifold installed. The keyway that bolts to the end of of the water pump shaft is too short to fit onto the key bolted to the cam. I thought I'd just have a longer one machined and put it on the water pump shaft. How tight do the tolerances have to be? I was thinking that the end play on the cam should be about .004" does this sound right? Also, being that the manifold is already installed, can I safely assume the cam is pushed all the way to the back of the motor and just machine in the needed end play between the key and the keyway on the pump shaft? Or should I pull the manifold and wedge the cam back and forth and measure it with a dial indicator (obviously at this point not the option im hoping for). Does what Im saying even make sense? Any help would be appreciated!