Use to turn those solid lifter 270 hp 57 Chevys running Jr. Stock Class 7200 RPMs and NHRA would only allow 56# on the valve seats. When you won stock class you had to pull a head and they checked it along with every thing else. The Hi-Rev hydro lifters will go 7000 RPMs a few times and then start falling off to about 6200 RPMS with Clifford springs set up at 170 spring hight and 125# on the seats. I have about 20,000 miles on my 250 with this set up now and the lifters will start pumping up at 5800 now. I may have missed it with your set up but 300+ lbs. on the seats must be for some sort of roller cam...
Jerry Davis II#4711
ol Smokey said "one test is worth a thousand expert opinions."
