For all Big Twins 1984-up with hydraulic or solid lifters. The adjusting screw is much longer and 40% thicker compared to other adjustable pushrods. This allows quick removal and installation of pushrods without having to disassemble the rockerbox. This is a great advantage when changing the camshaft. Made from finest 7/16” chrome-moly tubing with hardened wear surfaces. The adjusting screws feature two milled flats to facilitate secure locking.