[Lthompson]

Im wanting a good set of small block 350 heads that would be good for about 425-450 horsepower. I was thinking about maybe some edelbrock performer rpm's but im not sure. Can someone helpe me? thanks!

[killerformula]

I guess it depends if you're really hell-bent on getting 450 horse out of a 350. That number is much more easily gotten out of a 383, 400 or 400 stroker (like a 427). You'll be further ahead and fewer dollars in to switch to a 383. I would be willing to bet that a 450 horsepower 383 would smoke a 450 horsepower 350 too. This because the power would come on sooner, with a very probably flatter torque curve that comes on sooner. I guess my point is you can have a more streetable 450 horse with fewer dollars into heads and valvetrain and not have to rap the snot out of it if you build a larger cube motor.

Some Iron eagle 200cc or 215cc heads depending on cam and a pretty aggressive intake would work for the 383 combo. Your peak power can very possibly be around 5500RPM.

With the 350 you can expect to rev to higher than 6000 RPM, costing you wear, and valvetrain upgrades. You'll need a really fat cam (comps 292 would do, or go roller) and about 215cc heads.

Good luck whichever road u choose!

K

[firechicken383]

I think you would like the throttle response from the 170cc runners in the edelbrocks. However, pretty much any of the aftermarket heads should support 425 HP in a 350, but like killerformula said, it would be easier out of a 383/400. If you stick with a 350, Id keep heads 180's or under.