Cutting down valve tips

Should cutting the tips on stainless valves be done?

I ask because I bought some Racer Walsh valves which are 1/8" longer than stock and with everything on the head installed they are not closing completely during the compression cycle.

Or maybe I'm stuck ordering some shorter valves.

Oh, and this is on a '76 oval port head (no rollers)

Mike

RedLX, I bought the valves because from my understanding I needed the extra length for the larger cam I bought (280 duration, .460" lift) in order to put the tip of the valve in the proper area on the follower for it's range of motion.

Bogus SVO, Ya I goofed. I just told the machinest what I wanted him to do. He didn't know my whole setup. It probably would have been wiser to talk to someone before I went ahead and purchased the valves.

Anyway I'm thinking it would probably be smarter to just buy new valves rather than have them possibly mushroom on me. Maybe I'll just save these if I build another one someday.

Thanks guys

Mike