Take a hard look at the top of the valve train parts as they are now, adjusters and pushrods, check the torque on the shafts and go from there If you don't find anything up there remove the oil filter and cut it open and look real hard between the pleats for small debris, hopefully you won't find any cam and lifter debris Please let us know what you find
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)