Valvetrain Geometry

Newbomb Turk said

The pushrod side is at best a nasty compromise.

Edit: how old are those PRW rockers?
Mine are old enough that they are not the upgraded version.

Edit II: do you mind doing the test with real valve springs instead of checking springs? It will change the ratio and I’m wondering how shaft position may affect it. In other words, is the loss on ratio the same with different springs.

What are your thoughts on that?

Click to expand...

PRW rockers were purchased in 2025.

Changing to real springs would be a challenge and a totally different set-up. It would be tough to do with the gage blocks - how would you compress the spring to change the blocks? If a real cam was used to lift the valve then measuring actual lifter movement is more complicated. What changes would you expect to see? Only difference I would expect are those associated with load and deflection. Can't see that being much in a static situation (non-running engine).