[Steve C.]

"...in most applications we use the Crane 99893 valve spring, installed at 1.790-1.810", I set the intakes on the tighter side of the tolerance, I test all the springs and always put the ones with the higher pressures on the intake valves, since the intake valves weigh more and also have the momentum of the charge pushing on the back side of the valve while the exhaust valve if anything has pressure pushing or drawing it closed and the valve is lighter. On my digital InterComp spring tester the seat pressures on a new set of springs will range from 147-157lbs typically @ 1.800" and 380-390lbs @ 1.200" open pressure."

That comment was posted by Dave Bischopp within a discussion of the Old Faithful hydraulic roller cam, but NOT with the use of solid roller lifters.
At that time Crane rated that spring at 1.850 with 130 lbs seat pressure in their catalog.

Today with the Old Faithful 2.0 hyd roller cam Dave is using the Comp 26925 spring rated 141 lbs at 1.810"


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