Shimming old lifter to simulate preload for valvetrain setup

prorac1 said

This is exactly why I need to do this. But lifter preload must be taken into account. My results will not be accurate if I don't shim the test lifter at preload height.

Won't I just be fully depressing the piston to the bottom of its stroke if I don't shim it?

And if I make it solid at the top of its stroke, than the solid pushrod I'm using to check lift will hold the valve open?

Thank you to everyone for your advice and help.

It takes a village to build an engine. Lol.

Thanks again. Eric

Click to expand...

But the .040 is taken by the lifter, not the valve.
Yes, pull the lifter apart and shim it, either all the way and figure .040 in later for length or shim .040 from max cup rise and extend the checking push rod to zero lash while on the base circle of cam and do it that way.
You get your push rod length when you add .040.... but in the meantime, you'll have the same lift with the lifter cup at full rise and no .040 figured in yet to the push rod zero lashed....again, because the lifter eats the .040 preload!