Problem with lash closing up

[nhramnl]

Originally Posted by slick5861

I would assume over tightening distorts the adjusters causing lash movement when heated up. Harlen Sharp website calls
for 20 ft lbs on their rockers.

From what you state, you have a one cylinder problem. Has to be assumed that all 16 valves are adjusted using the same technique, so torquing of the adjuster nuts is probably not the problem. I would ask myself some questions, at this point. Are both intake and exhaust valve lash closing up, or just one of them? Does lash return to its original cold setting when the engine cools, or has lash now decreased by .003, both cold and hot? Is there ANYTHING different about the pieces used on that one cylinder (e.g. new/different rocker stand, new bolts securing the rocker stand to the head, repair to the cylinder head threads into which the rocker stand is screwed, previous cracked head repair in that immediate area, new/different valves on that cylinder, new/different lifter pair on that cylinder, valve seats replaced on that cylinder, and on and on). Good luck.