I agree Steve,
For hyd and solid flat tappets Harold's designs are extremely hard to beat. Solid rollers are awesome as well!
The hydraulic rollers have less max lift than some other designs, I think due to inverse radius design. For many applications more peak lift is a definite advantage, provided good valve stability.
Many put WAY too much emphasis on cam duration @ .050 values.
I like to look at everything across the valve lift and area curves. I'm very fortunate to have resources that "give me eyes" to see those targets. If I couldn't purchase a tool I built my own, in turn even greater vision. No surprise to me the OF cam works great for many, curve and area aligns nearly every dot in those applications. I've seen 1 or 2 max effort applications that surprised me.. for example a Chevy 383 running more than 1 inch valve lift and making 840 HP.
Last edited by pastry_chef; 09-19-2020 at 12:16 PM.
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