As mentioned the HIPPO solid roller lifters and considerably lighter than a retro-fit HR lifter. No need for more spring pressure with them. In my 455 with the 1st version OF cam it would rev to and past 6500rpm's so fast you'd have trouble moving the shifter quick enough to keep it from over-revving.
In my previous 455 with HR lifters it went "dead" at 5800rpm's. I even tried more spring pressure and it made no difference whatsoever, DONE at 5800rpms. Not a big deal because I typically shift at 5000rpm's at the track and went thru around 5200-5300 on top end. Raced the car like that for many years with zero issues anyplace.....
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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