I'm in the middle of checking proper valvetrain geometry and pushrod length on a 340. It's a hyd flat tappet cam. It appears I need a solid lifter to check the properly, as a dry (new) hyd lifter just compresses when the crank/cam is turned. I could disassemble the lifter and install a spacer to replicate the properly lashed hyd lifter for testing, and I see Hughes offers an adjustable lifter for testing purposes. Any thoughts? My friend has already bought the first set of pushrods, and these put the swept area on the valve tip outboard of the valve centerline. Thanks