I am reading in many cam specs an rpm peak of 6,300 rpm. I think the issue is what RickP just described.
In the case of the roller lifter assembly they have more mass and that's what limits the rpm.
I do remember turning my engine into the low 7000s with a Crower hydraulic "280" lifter cam, anti-pump up lifters and triple springs with no signs of valve float.
If this is the case, the lifters are going to be your rpm limiter.
My friend owned the Flip's Speed Shop Pro Stock Camaro in the late 80s. The hardest thing in the world to find out was at what rpm they would launch the car and what rpm they would shift it.
Kenny Delco was the driver.
Flip would never tell me the launch rpm but what he said was that Kenny would shift the car when the nose of the car would dip down, i.e., the end of the power curve.
I'm not sure they actually knew the exact rpm that was either? The vibration in the car was so violent that my eyes couldn't focus on anything. I don't see how Kenny could read a tach under those conditions either?
They could just follow the "blurry light to the end of the tunnel", so to speak?
Thought I'd add that just for color?
