I too had a upper end tap that I just couldn't get rid of, turned out I had some very badly worn guides and the valve stem would move outboard during lift. About 1/16" of the valve stem was visible past the rocker arm on the number 4 and 5 intake valves.

Last edited by sstock; 05/02/2013 11:58 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration