Quote from: gdaddy01 on August 07, 2018, 01:13:51 PM

lower rpm , maybe 5200 max , good low end , for heavy cars , trucks , maybe tow truck , trucks seem to be getting more and more popular . 50's , 60's and 70's trucks . just thinking out of my head , uh box .

We have no issues with hydraulic rollers and those rpms.  The issue comes with trying to pull "big boy" rpms with them.  I've seen some 6500 rpm hydraulic rollers here, but it takes some strategizing to get them to pull on up. 

I've actually got the hydraulic roller camshaft here for a higher rpm engine, but wanted to think outside the box a little more.

Brent,
The .750" wheel More stuff will go to 7500 rpm or better and not nose over, but as you have hinted to it takes the supporting cast of larger diameter pushrods, spring rates, and lightweight parts to assist this.   Now going with 6085 Morel with the .810", one can exceed the 8000 rpm range if the choose.