Anyone remember the member that had one for sale a while back?

Jegs: $262.99 http://www.jegs.com/i/Mopar+Performance/312/P4876337/10002/-1
Summit: $272.97 http://www.summitracing.com/parts/dcc-4876337/overview/

Not in stock either place.

I had one I thought about selling....then I thought better and had it ported. Works awesome BTW on Chapman CNC max wedge heads.

Contact Todd @ Marsh Racing

Nice Streetwize!

Wise.......... I'm guessing you now prefer it to the 440-2D?

When I ran one on a street/strip 572 I was as skeptical as anyone about how it would work, but it worked surprisingly well on that motor.

Fast,

Yeah the ported 337 works awesome with the Chap CNC Max Wedges on the 517 as you know i really liked the ported 2D but if anything the 337 is even better. The throttle response is even quicker than before. Revs like a comp eliminator motor...I'm impressed.

That looks good Wize. One of these days I hope to try the 337 on my 63. Ron

Wise, Where did you send the manifold to have it ported ?

I was pretty sure if you tried one you'd be a believer.

I think we tried to tell you that for a long time!

I did a lot of testing with the 337 intake a few years back and was shocked at how much power it made for me. It doesn't look like it would make much power since it is fairly low profile. But for some reason it really works. The porting on yours looks really nice. I always ran it as cast, I bet a ported verson would really work well.

Just to be clear...

I really had no doubt the 337 would be a very good intake, both Andy and Dwayne's dyno testing proved that to me)...it's just that my particular 440 2D has a lot of porting and ( correct me if I'm wrong) everybody who tested their 2D's againt a 337 never had the level of deep porting this one did, and even on 572" motors ( Old Hippie and Firefighter both have 572's) the advantage of the ootb 337 vs the ootb 2d was clear to see ....but not really 'eye popping' dramatic, especially considering the heads and short blocks they were compared on. You all tested 2Ds, just not THIS 2D.

To put it another way I assumed the ootb 337 superiority would be even less dramatic ( if at all) against MY Ported 2D....thats really all I was saying because I ran the 2D with both the as delivered MW ports and ported even deeper than the Dr Air article intake. Before I ported it you could feel the ootb 2D was holding my 517 back by around 4500-5000, but ported that went away and she would pull hard all the way to 6800. I suppose the dual plane cross section hits a choke point as cast and the deep porting helped, I had to go up 3 jet sizes as result of the porting I did.

When I learned that my good friend Hollis Page (HPEngines on Moparts) had teamed up with 30+ year veteran NASCAR porter and engine builder Larry Smith, well, it was pretty much a slam dunk. I had the 337 for several years and I gambled that if I ported it it might be worth changing out the 2d for it, turned out to be the right choice. I supposed as much as I ported the 2d, this motor still wanted a bit more.

So to be fair, I never tested my ported 2D against the as cast 337 ( I wanted to do a back to back chassis dyno test but my gut was it would be a wash - A few less lb/ft but maybe a few more hp up top. Didn't seem worth going after to me. Add to that the motors tested probably (by the bench flows quoted) weren't quite as high flowing at .300-.600 as my Chapmans, so the torque/hp trade off might have even been less dramatic on my motor, not below 5000 or so anyway.

You can probably tell from the pics my 337 has been worked masterfully... And (ported to ported) there certainly is an improvement over what was already a pretty stout manifold. What suprises me is I never would have believed the ( already very good) throttle response and off idle roll-on would be better with a single plane over a pretty healthy dual plane.

Turns out the manifold and heads (and Fast knows these very heads hands-on) seem very well suited to one another.

I have a vintage Holley Pro dominator W2 tunnel ram I'd love to let Larry work on next! I figure I have close to Indy race intake flow...that (as Andy points out) fits under a stock hood and has better street rpm velocity for better roll-on torque and drivability.

Just in case anyone else is interested in one of these I got one from Mopar performance for $224.00.

Good deal. That is a great price for that intake. Glad that MP still has some in stock.

Is the 337 a 4500 carb intake, or 4150? Any idea how much lower the 337 is than a super Victor? How much hood clearance would be gained with the 337 v the sv, and is the performance level similar?

The 337 is a 4150 flange, and is a very low profile. I wrote down the height difference in my notes, i would have to dig them up to see the exact difference(iirc it was close to 2 inches lower at the carb flange than my M1). I ran it for a short time and wasn't impressed, but after reading some of these responses about it in this thread, I'm wondering why I lost ET compared to my M1 ? maybe it's my combo ? my engine didnt seem to pull as hard thru upper rpm with the 337 compared to the M1. I lost a few mph with the 337.
https://scontent-iad3-1.xx.fbcdn.net/hph...110097384_o.jpg

standard or m/w ports?

both intakes are standard port as are my heads.

The 337 is a 4150 flange and it is a lot lower than a Super Victor. There are some old threads on here that cover the intake. I did a lot of dyno testing on that intake a few years back. The 337 has MW ports and a built in valley cover so it is the only single 4bbl intake that fits original MW heads on a RB block.

Here is an engine article I wrote that covers the 337 v. SV testing: http://www.hotrod.com/how-to/engine/mopp-1206-project-505-the-final-chapter/