Have decided not to replace chain at this time checked stretch both ways and come up with 1 degree figure I will not replace till it is 4 or 5 degrees even if the tensioner is at the end of its travel will see how many miles it takes to go beyond stretch limit. As I look down the top of engine at tensioner pin it sticks out about 1/4" from block do not know what its total limit is but did not seem to move a bit in last 2 yrs. What I will get done at this time is valve adjustment, new valve cover gasket to try to eliminate leak at rear of engine, and wam throwing the egr valve off for less crap on engine. Thanks for replys always something two do to keep these 30 yr. old antiques on the road but sure do give a good ride.