Setting cam geometry, Peak cam lift or peak valve lift? Options

[VaccaRabite]

Jake's site is down it seems, so I am going to ask this here.

I am about to set my pushrod geometry, but I am having a brain fart.

Do I use the peak cam lift or the peak valve lift.

I think that it has to be within 5% of peak valve lift, but I am just not sure, and I don't want to mess it up.

Also, does anyone have a copy of Jakes article for setting geometry? I pretty much remember the procedure, but I'd like to re-read it before I continue to make sure I have it right.

Zach

[Borderline]

Your rocker arms need to be ground down about 1/16" where the swivel cup of the adjuster gets close. I found that if I turned the adjuster all the way in to where the swivel cup hit the arm and then backed it out about 2 turns was a good starting place. It needs some clearance to allow the swivel cup to swivel when it opens the valve. Also, if you really think about it, to get the adjuster screw inline with the valve at the half lift point, you need to add shims to the rocker arm shafts. My cam is pretty low lift and I needed to add about .080" of shims under the rocker arm mounting blocks. I my opinion, this is more important than the length of the push rod. The higher lift cams will need smaller shims if any at all.

This photo shows the orientation of the rocker arm should be at half-lift. The valve stem should be exactly in line with adjuster screw at half lift. To get there, you have to adjust the pushrod length and the ht of the rocker arm shaft. IMHO