rumble, will a hyd. cam w/6800 rpm rating be as good as a solid lifter cam rated at 6800 rpm's. i really dont want to spin past 6500 but i'm looking at these cams to raise my torque to a higher rpm.
i know an old school guy that use to spin his cast crank 360 past 7200rpms, but i dont want to risk more than 6500rpm's
A solid cam can be ground with more duration @ .050 than a Hyd. cam. They can turn more RPM because theres no lifter pump up to hold the valves open. Since the cams differ little in price, this is what I would do. If price was not an option, I would do a roller.
Choose a cam that fits within the RPM range your operating in. There is absoultely no sense in getting a cam to large and even more so, one rated 1000 RPM above your operating RPM. Chances are, your peaking in HP at or right around 6,000 RPM. Even if the cam is rated at 4000 - 7000 rpm.
Also, IMO, save the money on a intake swap. Run the M-1. Being a single plain, it has an edge on HP in the higher RPM range, the one your cam operates best in and where the car launchs at, it's skipping any advantage of a dual plane.
Don't do what the old school guy is doing. If you didn't prep your engine to spin above 6000 rpm for any leangth of time besides finish line end run, you'll turn the engine into toast quick.