tom70

iTrader: (10)

plan on buying a set of gm performance cnc 821 heads. will hollow stem intake valves hold up to drag racing?

KCS

iTrader: (20)

Yep, lots of drage race combos have been run successfully with them. I'd be hesitant with a big solid roller and lots of spring pressure though.

tom70

iTrader: (10)

.622 lift with btr .650 duel springs

HighspeedLean

iTrader: (2)

.637 lift, 250 passes old BTR springs, and as of late, 7800-8000rpm in the lights. (Note to self:I should check the spring pressure one of these days.) If, for some reason I should need another set of intakes, these will be bought again.