The solid rollers always make more power.
1. the cam lobe provides more valvelift "area under the curve"
(the valve is open further, for longer)
2. Hyd roller lifters are heavy and tend to go into valve float/bounce at a lower rpm.
The hyd lifter is intolerant of any valvetrain separation. (lifter pump up)
The hyd lifter is intolerant of any oil foaming or momentary loss of oil pressure at the lifter or the agressive spring pressures
suitable to control a agressive cam profile.
You will find these street mechanical rollers hold the lash for a long long time.
You will find that if you cold lash at .004" to .006" tighter than the cam card hot lash spec
that the valvetrain is near noiseless and the running valve lash "hot lash" is correct when the motor is at running temp.
And setting the lash is much less painfull and faster.
use the springs comp recomends and set the installed spring height to spec.
Easy routine maintenance, superior performance and rpm . Often less actual valve train noise than a fast action hyd roller.
Unless you are absolutly allergic to removing the valve covers 1 or manybe 2 times a year,
you will really like one of these cool solid street roller cams.
All the real fast guys that run hyd roller cams and lifters (for street duty) cheat and swap in solid roller lifters when they actually race for money.
They lash at .001 to .006" and only run it like that for limited racing.
Last edited by F-BIRD'88; 08-09-2012 at 01:06 AM.