I've been trying out a set of the MRE 1.60 rocker arms and they look pretty good on these heads. With my 0.445 lobe they are .737 with a checking spring and .702 with a real spring. So 1.66 ratio with a checking spring and 1.58 with 700 lbs of load. With a flat tappet spring I'm sure they would be 1.60 or more. Seems to be plenty of clearance everywhere and the oiling passages look good. I haven't run the engine yet but I don't see any reason not too.