had the timing chain changed out of concern
received a call from the mechanic the car is finished
replacement of timing chain
timing chain , replaced upper cylinder head mounted chain guides, tensioner with chain clamping rail, r/s valve cover gasket, plugs, fuel vapor canister, replaced all rocker arms, are new.
along with the removal and cleaning of camshaft oil tubes,
cleaned and flushed cooling sys refilled with mb coolant.
the cam shaft had been changed somtime in the past without changing the rocker arms
the shaft is fine changed the rocker arms due to wear
thanks all, for the advice - i would not have known about the timing chain issue if it weren t for this site and the people who visit