340 Hydraulic Roller Available?

Performance goal? Even not knowing the answer I really don’t think you will need a roller. Think of it this way. The positives for a roller lifter=you can run very aggressive ramps and snap the valve open to a usable lift very quickly. With that you need substantial valve train to survive. Now think about the down side to hydr lifters=don’t like high spring pressures/rpm and aggressive ramps. A hydr roller is like mating a great white with a goldfish.