RHS head valve train geometry issue

RAMM said

I think if I were in that boat I would grab a 7/8" ball nose end mill and make a pass about .050" deeper. I'm sure that would make a significant improvement. I wouldn't want to take more than .100" though as that may put the adjuster into a really funky angle with the pushrod.

I guess the main thing I take away from this is that even though the RHS LA-X is marketed in a way that makes you believe that you can use your existing shaft rockers from your early LA heads--This is simply not the case as evidenced here. I have a set of RHS's on the way so I can do some testing. J.Rob

Click to expand...

Ramm / Lil Red - I'm not sure deepening the trench will help - the issue is simply one of distance between the rocker shaft pedestals and the valve guides.

Unlike the intersecting vectors that create "off centre" sweep, this is just about horizontal distance between point A and point B

If you deepen the trench, the rocker will pivot slightly upwards in the "rest" position, - but ultimately when the rocker moves down to the horizontal plane as pictured, the distance issue will remain - and the roller tip will be off centre to almost off the valve tip at fully open.:oops:

As D-Mailman indicated - IMHO the only real "fix" is to re-position the shaft pedestals further from the valve tip...or use the rockers that are known to work......

My 2c