I finish breaking in a new pump gas motor on my motor run in stand today, I had set the lifter preload at room temps. and knew that I would need to reset it with the motor warmed up, hot.
The heads and rocker arms are the Speed Master brand and version of the Eddy Victor with Speed Master bushed extrude aluminum 1.6 ratio rocker arm kit with 7/16 adjuster screws, the heads are CNC ported to 325 CC but they are not M.W. size intake ports.
I set the preload at 1/3 of a turn cold, I had free play on most of the rocker adjuster when warmed up and tried using 1/3 turn preload hot, that didn't work
That amount of preload would hold the valves open
I ended up having to use 1/8 turn preload hot to get it to start and run. I'll see what it does in the morning cold
I'm thinking the heads will shrink down when cold adding more preload and I'm hoping it starts and runs okay