Valve train geometry

Comp? Who is Com....oh, you mean the cam company who has a spintron, but still applies stock rocker geometry to a roller rocker. Yeah, Not at all helpful.

I never understood why a cam grinder, or anyone else, would recommend altering the information ground into the cam lobe by screwing with the rocker efficiency. What ever do the Formula 1 teams do with those overhead cams and no rocker arms to jack around. Hmm, maybe they just have a great cam lobe and properly matched components in the valvetrain. That makes a lot more sense to me.

My point with the rocker fulcrum length is that we have a cylinder head design and a rocker arm that is supposedly designed for that head. Why is it necessary to move the stands or studs so the rocker fits properly. This is something else I addressed with my custom rockers.

More lift will give more sweep, so reducing the ratio with pushrod length will reduce net lift and result in less sweep.

The only changes I make to off the shelf rockers, is to change them from ball to cup style adjusters. That helps the pushod geometry slightly, and makes pushrod selection easier. It does not make it perfect. My custom rockers exist simply because there aren't any rockers off the shelf that have the correct adjuster geometry. You mention my spacers being a good start. Well, they are the best that can be done to help, not fix, the rockers that are available. If you want it all to be perfect, my custom rockers, in conjunction with the shaft spacers, is the only game in town.

I believe I mentioned it before, but my kits don't correct the rockers. They correct the heads so the stand heights are correct for proper valve side geometry. If you want the pushrod side to be correct, the rocker has to be designed with the correct fulcrum point in mind. None of the shelf rockers do that. Not sure if I mentioned it, but my custom rockers do.:D

Thanks for the dialog. I like people who know how to think. I'm sure we'll be able to learn a few things from each other in the future.