Go set the lash at whatever you want cold. Then get the engine up to temp. Not just in the drive way. Then pull the cover and check one cylinder. It will be .003-.004 LOOSER than what you set them at.
I can vouch for that.
I set the preload on my FTHydros to 1/4 turn cold.. After cam break-in there were a few noisy ones. I thought the cam was done. After the engine cooled, I checked the preload again, and you guessed it, not all were 1/4 turn, but no loose ones. I tightened them up to 1/2 turn and that was the end of it....... for a long time. .
1/4 turn, IMO, is just too hard to set accurately.
I think those adjusters are 28TPI so 1/4 turn would be about .009;
I wouldda thought that would be enough,but
I was wrong.
Eddy headed 367 , running at 205*F, measured at the hottest part of the stat-house.
