That's the common thought on that BUT I read a few months ago of how a very reputable dirt modified engine builder sez he really sees very little performance differences between a flat tappet vs. roller in his engine builds.
a small wheel/ small base circle roller cannot match a FT- physically impossible
Flat flank on the roller and all that
now one of Mike Jones Inverse radius profiles...
To the Krooser & the OP on wyrms comment....
True, but as the bar is raised on a .904 & larger tappet, the spread disappears a lot. It’s small with lesser lifter diameters when the cams are small and limited and the builds mild. And yes, IMO that applies to a 30K engine because it is not a all out hold nothing back drag build. Not disrespecting the builder, that’s just simply where it’s at.
A solid cam cam and will do the job super well if the grind is correct. Rollers are called the ultimate for a reason but few ever get close to what they can do.
I was concerned about the holes getting plugged, but have had them for 7 years. Have had them out of the motor about 3-4 times since. Check each one and they were clear. I don’t remember who made them, but I would go EDM again in the future.
