ok here we go.i gunned my car the other week and heard a rattle sound from the head.so i went and bought some tappet's.still had the problem.someone told me it might b the cam's.so off i went bought some new cam's.the problem is still there.i'm at my wit's end

.anyone got any idea's what it might b.b4 i go and buy another head.it's 2wd saff cos by the way.
thanx simon