Notched Intakes

I think this is supposed to improve mixture distribution at mid and top-end, by allowing a little 'cross-pulsing' of the intakes between the two plenums. It was most often used on open plenum intakes in the 60 & 70s, to tune the primaries & secondaries with a big Holley, and I'm doubtful as to how much it actually helps on a street engine. Is this a new intake or a replica?

Actually, I saw this manifold in the CARTECH publication of "High Performance Ford Engine Parts Interchange". It was in the Big-Block section, Chapter 15: Induction System. I don't know if this item is available, but was curious if anyone has tried this type of modification.

Thanks for the reply,
Rodger

FWIW, Rodger, I modified an open-plenum 351C intake for a friend, by milling 2 small notches in the carb pad for an 0.060" thick removeable divider plate that hung down about half-way in the plenum & was retained by the carb on top of it. Since the engine dynoed at over 450 horses, I don't know how effective it was. Hise Pantera was scary-fast every time I drove it, with or without the divider. But the intake pulses that reflect back into the plenum soon BROKE the divider, whch ended up jammed into an intake port! Forunately, it didn't quite get into the seat area, but if you build something to insert in an intake, I suggest you make it substantial and weld it