I run through the traps as high as 7800 rpm, and figure it might be worth going to a hollow stem steel valve? I plan on going to an .850 lift combo, and may need an additional .050 length beyond the BBC 5.444 (+.100)valves now in the heads.
Would appreciate anyone's experience with these.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky