I have a motor with a set of Victor heads with M.W. intake ports, I bought a unused top end kit from a member on here. It came with a set of Hughes 1.5 rockers, I called Hughes to find out how much spring pressure they would hold up to and once I told them I was shooting for 250 to 275 lbs on the seats and from 640 to 680 lbs opended at .700 (solid roller cam from Bullet)they said to send them back and exchanged them for a cyro treated set for the shipping and cyro treating charges only I ended up getting a set of thier 1.6 cyro treated rockers and I had to grind my heads to clear the Mnaton 3/8 pushrods. I ended up having several of those adjusters come loose after racing the motor last year, after having the second one fail and ruin another rocker arm, adjuster and pushrod I bought a set of heat treated(very expensive, $14.00 each) adjusters only, not the Manton 12 point lock nuts One of those original lock nuts came loose agian ruining another rocker arm, adjuster and pushrod so I bought a complete set of Harland Sharp rockers for those heads, several of the intake pushrods rubbed and made the adjusters come loose agian I just finished grinding both heads last week to make sure there is absolutely no rubbing by the pushrods to the heads or block cold Set the lash and use your fingers to turn, rotate, the pushrods between the rockers and lifters with the intake manifold and valley pan off with both valves closed, if they rotate freely cold your probally golden That's the way I did mine this time, IHTHS I was going to take some pictures of both heads after the grinding but I didn't do to not knowing now how to attach pictures now, sorry Good luck