The +.050" locks will shorten the effective valve tip length.
If you do not want to go to the expense of purchasing valves with .290" tips, use locks designed with a recess for lash caps...... but do not use the lash caps. The lash cap recess will proved a little more clearance for the self aligning full roller rocker rails. I ran those type locks for about 4,000 miles with Scorpion narrow body, self aligning, full roller rocker arms before I installed better heads with Manley SS valves that had .290" tips. I inspected the locks and rocker arms regularly because I realized that was not the best way to solve the problem. Unfortunately, lash cap locks will not help if you are using stock self aligning rocker arms. The alignment nubs on the stock self aligning rocker arms are too large.
I would probably have still been using the Comp Cams 10* Super locks designed for lash cap locks if I had not installed the better heads I had prepared with Manley valves. I replaced the 10* lash cap locks with standard 10* Super Locks and have .035" clearance between the rocker rails and the locks. .
Last edited by MouseFink; 01-13-2013 at 04:41 AM.