Hey Jyd, When I head the heads off I put #1 piston at T.D.C. and when I reassembled the motor and installed the damper the line was at tdc so I believe my timing marks are ok. The performance hasn't improved with advancing timing, but I will try some more advance. This car idles way to smooth for this cam. If I installed it a tooth off would it idle this smooth? Maybe I have it retarded, like me