[Barry_R]

Hydraulic rollers are in continuous contact with the lobe, under preload - completely different situation and they'll last a bazillion miles as a result - unless you #$% up.

I do more FEs than anything else. I have some pretty decent directional data that the newer high rate cam profiles are not all that wonderful on street engines with a high ratio valvetrain - FEs are 1.76:1. It's tougher to maintain valve control as the acceleration rate increases. Milder/softer lobes are easier to deal with - lower spring pressures and/or higher RPM with a given spring. Easier on mounting hardware, and perhaps a directional lesson on solid roller selection for street use with an eye toward durability....