Kirby had a few sets of prototype hydraulic roller lifters made a few years ago. But at this time, no cam company makes a hydraulic roller lifter for these engines as a production item, and has no interest to. While these engines might seem to be the greatest thing to us, it really isn't to them, and they have no desire to persue this type of product. So that only leaves it to ourselves to do it. I also saw on another forum that Cloyes as of now is discontinuing its double roller timing sets for the Slant 6 Chrysler, which is every bit as large in the inline community as the modern Chevy 250's and 292's. The Slant 6 forum arranged a group buy of timing sets and bought almost 100 sets at one time. This still wasn't enough to interest Cloyes to continue making them. Other companies unfortunately think the same way and will likely drop their inline oriented products as well before long if we don't try to make a difference.
yes understood the problem of no cam to go with these lifters, But Im building a 181 mercruiser and there are hydraulic roller cams on the shelf for the iron duke ( which uses a D shaped Roller lifter that self indexes in a D shaped bore --and one version of the duke has a cam thats interchangable with the 153/181 chevy 4 cylinder
