[Myron Piatek]

Just my take on it, but since they ramble on about hydraulic lifters, it might appear that hydraulic rollers may be used in place of hydraulic flat tappets, like Jeff originally thought. If solids were allowed, then the words like "plunger", "plugged" & "bottomed" should have been eliminated.


Solids in place of hydraulics would have been cheaper & simpler. But with rollers you have to change the cam and possibly pushrods & springs to accommodate a roller profile & lifters!