Depends, you have a hydraulic roller cam? I don't think you could rev it much past 7000 rpm using conventional components. Solid roller, no sweat. I have a solid roller SBC (my private shame I know
) but its seen 9000 rpm a number of times.
Comp Cams new magnum hydraulic rollers are supposed to offer much better plunger alignment that allows extended revs.
Everything is a give and take in this area!
Hmmm. going in one extreme you could try and get better flow from a smaller valve switch the valve material to titanium, along with the retainer and go with the CC magnum hyd roller lifters, make sure your springs and pushrods are matched elements to the rest of the valvetrain, but thats an expensive proposition!
Is the carbed guy running a hyd roller? besides the factory rev limiter, an EFI engine could rev as high with the same eqipment (v-train wise), but whats the point if the engine is revved past its useful powerband? Besides with the factory style hyd rollers, things get sloppy that high and start costing power.
AFW was suppossedly developing a rev kit for hydraulic roller equipped engines, that made better power because of more accurate valve control. Supposed to be still under development, but I think they canned it because of the scant clearence between the heads and the lifter body or lifter boss?