Why the hate for HR cams.

And it has got so silly that one hyd lifter seller states that his lifters should be used with a certain centi/stoke value for the oil. Failure to do so, all bets are off.....
Harley Davidson in 1948 or 49 introduced the modern hyd lifter function. Detroit 'borrowed' the design. Originally, the hyd mechanism was mounted in the top of the prod, moved to the lifter body the following year. The mechanism was never designed to work with brutal valve spring pressure used today & it is no wonder that the lifters collapse/make noise.