i pulled my manifold off to change liftrs becuase one was tapping, i thought it was collapsed. cilynder #1 lifters, between them was a cam bearing, i looked at all lifters, nice shiny, not carving nothing. Engine looks new also. So now i'm gonan pull the motor out AGAIN and do the cam bearings. i'm gonna have the cam checked, if its bad i'll put a new one in. I was told that cam bearings are common on caddy motors period. And i did notice about 6 moths ago that my oil PSI dropped 10 psi lower cold, and 2 psi lower warm. that is why my lifter was tapping on a hot start, not enough pressure, not enough oil to lifters. I'll have that engine on the ground in 45 minutes.