Too much intake

Grn92LX said:

Again, RPM ratings mean squat! That ALL changes with bigger cubes, cam timing, spacers. I've seen a dyno graph of a 347 with a mild buddy rawls custom solid roller cam on a TW headed 347 with a trickflow R manifold and it DIED after 5500 and made lots of low end torque because thats what the guy wanted.
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well, no, rpm ratings do mean EVERYTHING, because when you look at those rpm ratings it tell you what parts they want you to compliment that cam with example:
comp xe274hr (for compuer compatible 5.0 based engines)
hydraulic roller- 2500 stall (or stick) 3:55 or higher gears, better heads, intake and fuel system.
operating range- 2200-6200

if you selected a manifold with a matching RPM range like:
edelbrock Performer RPM II (part #7123)
operating range- 1500 - 7000 (making considerable power gains from 1500-6500)

say the same motor had a set of Edelbrock RPM heads (1500-6500) and 10.5:1 compression, it would make awesome torque and hold it from 2000-6500 rpm, and make peak power somewhere near 6200, it wouldn't matter if it was a 347 or a 302, the powerband would be within 100 rpm of each other, yes, its bigger, but isnt a super high compression (13.5:1 comp.) 408 windsor, if you wanna race car- then build a build a big inch race motor, then you can take advantage of the torque a real big motor affords you. But if you're building a streetable (less than 12:1 compression) 347 you arent going to be getting into anything wild enough to even consider some of the minute differences race stuff incorporates. Once again, just build a well matched combination, it'll generate solid power and you'll be happy in the end.

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