[347]

I am currently making around 435fwhp @6200RPM from my 347 with 10.1. comp alloy heads,solid flat 248@.050.560lift etc....
If I was to go up in cam to a solid roller about mid .600 lift,250 ish@ .050
would I make around 480 maybe 500 at no more than 7000rpm?
Would my 10.1comp make to undrivable down low in the revs when I drive it on the street(occasionally)
I have a tremmec 3550 and 4.1 gears

[blown5.0]

well to put things in prospective, my motor is a 302 cid stock bore, crank, rods, balanced, 9.75:1, tfs heads, air gap intake, 650 race demon carb, 1 3/4"-1 7/8" bassani step headers into custom 3" x pipe exhaust, and a custom extreme energy HR cam and it makes 365rwhp which is about 430 at the flywheel. cam is only 230deg at .050" with only .547" lift, max hp at 5900 rpm.

my point is you have a old school flat tappet cam, a hydraulic roller cam is 20 times better and a mechanical roller cam is probably 30 times better. I'd like to know what your current combo is but I have 30-50hp gains on a 302 just from flat tappet to HR of the same duration at .050", and if you add a bit more duration on that its even more power in the upper rpms.

the thing is mechanical roller cams have serious ramp rates and high lifts which kill valve springs therefor making them not good for the street unless you want to mess with it every 1000 miles. the hot ticket for good long life and great power is the hydraulic roller, cheap, no regular adj are needed, but your limited to like 240 deg of duration and 6500 rpm or so as the hydraulics start to colapse beyond that. but a HR roller will make tons more power than the old school mech flat tappet.

best bet is to get the HR kit with a compcams custom extreme energy cam.

[EMW150]

I'm not familiar with your heads, but it they're aluminum I'd get that compression up to around 11:1. You can still run pump gas and the cam you're currently running would be alot more effective with more compression. You can make good power with a solid flat tappet lifter. Don't be afraid to spin the thing. I'm shifting at 7,600 rpms with a cam in the range you're talking about getting. Solid flat tappets are nice and light and don't mind revving. Mine is hydraulic roller but there is no rpm advantage there over a flat tappet cam. The only advantage to a hydro-roller is like said above, you can run aggressive ramps and build cylinder pressure.