We were one of the first cam grinders to take advantage of the larger .904" lifter in Chryslers and get more aggresive with the lift in the 1950's. These KV profiles were are latest and most extreme. Our classic K-8 grind in a chrysler is exactly the same rise and fall table as our RK-38 Roller grind in a chevy. So it takes a roller to be as aggresive in a chevy as a flat tappet in a chrysler.