[Wbulk]

I knew you guys would get this. Think of how much money the cam companies are making selling push rods to guys that think the stem pattern is the most important. I called the big cam company tech support to determine what heads and rockers they use to design and test their cams on a 5.0 roller. He didn't know and could not discuss the issue. I found out later they don't even make their own rockers, so they have no idea of the issues. There are a lot of issues with rocker geometry that are never discussed. How the rocker is made is critical to that ever changing arch of the rocker as it moves through it's travel.

Consider, a cam that is designed with one set of heads and rockers vs. another head and different rockers. Then you add in how the geometry of the rocker is set up. The result on the engine performance could be significantly different. Explaining why one guy hates a cam and another loves it; maybe it's not the cam.

Interesting, when I called Scorpion they knew exactly what heads are used to test their rockers. The relationship of the valve tip, to the pivot point, to the push rod height all effect the geometry. We put so much importance on making sure the cam is degreed in to spec., but little to none on the rest of the items to insure the opening of the valve is actually tuned.

This is a tough subject. I am going to do some testing. I am thinking put the degree wheel back on and test stock vs. mid-lift method taking valve height readings every 10 degrees of crank rotation during the cycle of the valve. The test method is important, so if you have an opinion on how it should be set up lets hear it. On the other hand if you have information on tech articles where this has been done, point me in that direction.

Another interesting video on push rod length effecting rocker ratio, which all ties in.
[ame="https://www.youtube.com/watch?v=RjaosX63DkM"]https://www.youtube.com/watch?v=RjaosX63DkM[/ame]