Bumping for GregsDart and anyone else. Greg, the oiling orifice is likely an oddball size so to find brass that will press-in may require some machining. I remember seeing a set of lifters that BoatRacer572?, with the Predator builds out in California, posted that had brass in them to restrict. Maybe he will offer what he did? But as Doug pointed out his system has the same orifice area using thinner oil and has very good pressure (not that it is correct, but it's working) As THAT thread was concluding maybe you have a smaller base circle and that has caused direct unrestricted presssureized orifice exposure.