Sorry but the biggest problem is not a 40 year old block or putting a roller cam in a motor, It is matching of parts. They now have pressurized roller lifters. I will still add a .010 groove in each bore to add more
oil to the mating surfaces. Roller lifters are breaking from the drop of a ..400" lift lobe down to the base circle of the cam."FREE FALL" This is because we want the valves to close as fast as possible. I just got my custom cam from KCR and it is a little smaller than the two he uses the most. There is only a 20 hp different. There is catalog after catalog that tells the matching parts to build a motor from compression, valve size, spring strenght, rpm range, manifold, keepers, pushrods for correct centering of the rocker on the valve tip. We just don't want to follow directions. Rick L. ps I am at fault also.
