Re: 455 hydraulic roller lifters?
See page 65 of their catalog. They mention they can grind something as low as 0.300" lobe lift. I'd imagine a short duration grind can tolerate a lot more than that before piston to valve clearance becomes a problem.
Fuel & Brake Systems Engineer
1967 Wildcat, 4575 lbs. 10.8:1 462 on pump gas, Gessler Level 3 TA SE aluminum heads
0.602"/0.622" lift, 260°/273° @ 0.050"¯, 108° LS solid cam. TA SP1 intake, 1000 cfm BG Silver Claw
Custom stainless equal length headers & exhaust w/Borlas. Variable Pitch TH400 full manual, 3200/1200 stall