390 w/open chamber heads

The gains from the RPM intake would be "felt" higher in the rpm range (mostly midrange), but not by much. Frosty pointed out an intake comparison with all those intakes, but the article didn't really go into much detail about the build other than it was a 360 longblock with 10:1, a solid cam, and mildly ported Edelbrock heads. We're already making differences there because the OP will be running a 390, with ported 360 heads, and a hydraulic cam. And as much as we ALL love seeing numbers on a dyno, until it goes in the car and gets tuned, dyno numbers are just that-numbers.

The performer intake is for up to 360 cubes, mild cam (<220* @ 050), stock or lightly modified heads, ~9:1 compression, and stock to slightly modded exhaust...when you add cubes, the power band gets shifted down...much like if you slid the same cam in a 318 then in a 360 if all things else being equal, the 360 would likely peak a little lower because the stroke is longer and it eats up the duration, like was mentioned on either the 1st or 2nd page.

The RPM would still make power plenty well with even a mild 390 and would pull harder in the midrange, but, I've already stated that, and I think treblig is pretty well happy with the idea of port matching his performer--it's the OP's engine, and he can do with it as he pleases...it will indeed work, and it'll probably be plenty good enough for what he's wanting to do, and the difference between the two intakes would be about 20-30hp peak, and about the same for the torque. The torque would be different in the midrange, probably between 2500-4000, and the increased hp, depending on the cam, timing, exhaust etc, would likely be about 3500-5500.

I don't think anyone on here ever said the performer wouldn't work for his app, but more that the RPM would be better suited for the build simply due to the breathing requirements brought on by the extra cubes and by the cam he's likely to run. It's all good though, as long as he gets quality machine work done, and gets some decently matched parts, it'll run great.

...just hope he doesn't get behind the wheel and think, maybe I shoulda coulda woulda....know what I mean?