[Formulajones]

Originally Posted by pokey1

I was running the RPM intake for several years. I went with FAST 2.0 and the northwind intake ported for my heads. What surprised me was the bottom end seemed to be much better with the single plane. I was told at the time that you could have burbles (from unequal pressures) with the dual plane and could minimize that by gutting the center runner like a Gap intake to equalize pressure

I've always found a pinch of power on those RPM air gaps by installing a 1" open spacer. That basically is like removing some of that divider and adding a little plenum volume at the same time without cutting anything. It's a simple change that tells you right away if it's heading in the right direction without modifying something that is difficult to reverse.

I don't know why the Pontiac RPM air gap intakes come with a full divider but on other engine models the RPM air gap intake has the divider already cut down. Always thought that was strange.

It's been shown on the dyno that taking the divider down about 1 inch on the regular RPM intakes to mimic the air gap, picks up power. I've seen that outcome on several different types of engines. I'm sure it does affect fuel distribution to some degree.