[Formulajones]

Speaking of intake testing, we had the opposite affect than what Steve C. posted. However we were using a 462 Pontiac so rather small compared to Steve's engine.
It was a bit over 10:1 and had Kauffman CNC ported Edelbrock round ports that were supposed to be his 330 cfm package. He also spec'd the hydraulic roller which was a 254/262 @ .050 on a 110 LSA. Lift was in the 600's with a 1.65 rocker.

We tried the RPM intake with and without spacers, the Victor and the Torquer II with spacers. None of these intakes were ported and were right out of the box. All intakes were tested with a 950 HP holley.

I thought for sure the single plane would be supreme but for what ever reason the best setup on that engine was the RPM with a 1" open spacer. It made best HP and had a better average torque curve throughout.

That engine was supposed to be Kauffmans 600hp and tq package according to Jeff. Well it fell way short of the HP and made just over 500 but it did make over 600 ft lbs. of torque. I think it was like 605 ft lbs. It was on a pretty stingy DTS dyno that was also used to test a bunch of engine master engines and was said to be more accurate. In the end neither single plane even cracked the 500hp mark that day. That engine just didn't like them at all.

Didn't matter really, the engine did perform in the car as expected which is what really counts, with a 4120lbs race weight it ran easy mid 11's at 116 mph on a small drag radial, mild continental converter and 3.73 gear, With nice little wheelies, and drove around on the street for years, was actually fairly docile to drive.

I really have never seen this scenario play out on a bigger engine though. Typically 500+ cubic inch engines benefit from a good single plane and on a street car with a small tire and engines of that size, softening the torque a bit below 3500 rpm isn't a bad thing. You'll already have more than you can handle most likely.