When you ask this question, you get a lot of different opinions. We can talk about spring pressures, oil, cam cores, lifter styles, lash, lifter maintenance, lifter brand, bushings vs bearings, etc, etc.
Certainly, which one to use depends on the intended use. The bigger the cam and the higher the necessary spring pressures that comes with that tends to favor the rollers.
For my primarily street Hemi, low maintenance and durability was very important. I talked to several major Mopar engine builders about which style cam to run.
For me, Ray Barton's recommendation of the tool steel flat solid tappet was the best choice. And it has worked well.
Not trying to be a smart a--, but have you checked the cam lobe nose ? me and others did not fair so well with tool steel lifters. I was going solid roller, I now am going with the Morel High RPM, push rod oil, Hydro roller.
HUG 6074
BB RACE HYDRAULIC ROLLER LIFTER SET
GOOD FOR UP TO 225# SEAT PRESSURE & 550# OPEN
$919.47
Set of 16 Big Block Hydraulic Race Roller Lifters. These are oil thru lifters and will oil through the pushrods if you need them to.
Suggested maximum spring pressure: 225# on the seat 550# full lift
DO NOT RUN OIL THICKER THAN 5W40 WITH THESE LIFTERS.
.810" roller
* The lifter bores do not need to be bushed to run these lifters.
* DO NOT use these lifters with a flat tappet cam!
Note: These lifters also fit the AMC V8 engines.
