Not alot of info out there on this intake, I got one and compared it to my M1 RB 4150 single plane and thought I would post the info. The 337 is a 4150 flange single plane for RB with Max wedge sized ports with a cast in valley pan. While it is billed as Max Wedge size ports they are far undersize. This should allow them to be used on std. port heads with some port work. It it shorter then the std. M1 intake and is around $260.

As cast port sizes, Max Wedge should be around 2.63 x 1.35

Std. gasket

It is about 1/4 shorter at front and 3/8 shorter at the rear of the carb flange.

Carb flange is straight not tilted like the Std. M1

Plenum

Std. M1 plenum

Rough measurement of how much the intake ports on a Std. port Trick Flow head will need to be opened up to work with this intake. To the outside of the markings, Should be around a 2.47 x 1.32 port opening.

The 337 is a really good intake. It solves a problem that no other intake solves and it works a lot better than it looks. I made 800 hp with that intake on my old 505. That was out of the box, I'm sure it would've picked up another 25 hp or more if it had been port matched.

http://www.hotrod.com/how-to/engine/mopp-1206-project-505-the-final-chapter/

I have a ported 337 on my 517, works great

Is this intake available again?

I thought it was unobtainable a few months back...

I just got this one last week from my local Mopar dealer. Summit and Jegs showed it on back order. I had it in 3 days from the dealer and they said there were 3 more left in the system at that time.

Interesting info & pics.

It would probably take some serious grinding and Belzona to make a '337' work for me, but it looks cool.

It is one of the best BB intakes made

It's one of the best intakes no one uses. I have one on a 440 with MW Performers and it runs great. Good price and the built in valley tray is a big plus.

It also makes for a nice fit on a Low Deck with Stage VI heads

I wonder if the TF heads would pick up any flow by making them the size of that manifold.
There is certainly plenty of meat on the head to go that big(or even out to full MW size).

Mmmmmmm, not so much I think.

The bigger question in my mind would be, how well does it work on a 440-470ci street strip combo?
493+ I'm sure it's good...... Might be a tad big on a 440-470(depending on the rest of the combo of course).

I had commented before that as delivered the ports are about 1/2 way between 906 and true Max Wedge, I really think they did this on purpose ( or maybe, knowing Ma MoPar) probably more a 'fortunate accident'....for a change.

What's key to this manifold is the awesome taper ratio from the plenum to the port, great for Horsepower although lower end torque may be down a tad vs say a traditional M1 off idle on a 440-470" motor.

I'd love to see someone try it.

It's a little unsightly with the extra bosses and such on it too......I'd have to trim that stuff off if I were going to actually run it in my car.