RHS head valve train geometry issue

Cudafever said

When i got my RHS heads from Brian @IMM and put my unknown brand roller tip adj rocker arms on. I had to shim the crap out of them to get the roller tip on center.
Took picture of the valve tip with and without the shims. Brian told me that the shims were causing other problem and that i should install it without them. Said that the tip being just off center would be just fine. and he was right Works just fine.

After reading on B3RE's sight, i begin to understand why Brian said what he said.

My Geometry isn't perfect but at 5800 rpm, it don't need to be.

Click to expand...

"Causing other problem" is pretty vague. I'd be curious to know what the specifics were.

I would have to argue that the geometry needs to be correct no matter what rpm the engine is running. I have had a valvetrain start to become unglued as low as 4000 rpm when the geometry wasn't right. Corrected, the same motor spun freely to 6000, and peak power was at 5200. Mild engines need proper geometry too.

I don't understand why the valvetrain isn't important until the motor sees 7000+ rpm. Drop a valve at 5000 and you will be replacing a lot more than just a valve.