I finally made time and it is done. Fortunately it was only out about 1/8 inch. I was pushing my luck at 248,030 miles,but its done now. Along with valve adjustment & new gaskets, 3k gsk, 100 plate, new water pump , new radiator ,lower hose,and a thermostat. And 2 crank seals#@$%! . I feel much better about the truck now. Only down side is egt's are little higher and after a test drive(read flog session) looks like the injectors are weeping. Thanks TDR a wealth of info and thanks to the people that answered my questions.
Eric
Eric