273 adjustable rocker arms

The big issue with 273 adjustable IS , unless they are NOS or aftermarket they are probably worn to the point of them not being effective . Ditto with stamped ones . The advantage is their strength . As far as measuring them goes , to do it right you need a fixture and a dial indicator to determine the ratio . O course , if your using a solid lifter cam you must use adjustable rockers . Hope this helps .