this manifold for the Stage 6 head, is it extra wide so you don't need spacers when installed on a RB engine? i want to install it on a B engine but conflicting stories has me thinking it is not going to fit. i live downunder & don't want to make a mistake & order a manifold that is not for my application. i know you use a 440 manifold for this combo but this MP manifold has the cast in valley tray which will fix that issue as well. the Stage 6 heads are max wedge ports.

I don't think Mopar ever made a B version of the Stage VI intake. Only ones I've ever seen in the catalog were for RB engines with Stage VI heads. Zippy would know for sure.

Indy rb manifold fits stage 6 heads on a low deck block

Going from memory here...
- MP made B & RB valley covers intended to work w/ the Stage VI heads, but they weren't exactly sophisticated... just stamped aluminum plates w/ the head-side edges turned up where they run into the heads
- I thought those MP covers were supposed to be sandwiched between the optional RB spacers and the heads themselves, which is how I used it on an RB w/ a standard-type RB intake
- Not exactly sure how the B valley cover would seal when using an RB intake that didn't use the spacers, other than a sh!tload of RTV along the edge where it butted up against the heads
- The '337 intake won't do what you're looking for since the integral valley cover of that intake will still sit way above the front & rear edges of the block, unless you fabricate some type of spacers like AndyF shows he made in his book to do something similar when using the '337 intake w/ Edebrock Victor heads
- The dedicated RB Stage VI intakes won't do what you're looking for either and, I suspect, would require cutting off the integral valley cover to even line up the ports

Maybe you can make something like, or possibly modify, the valley covers that either Hughes or 440 Source sell. I'd suggest fabricating your own to allow a wider strip of material on the head-sides of the plate, then drilling & tapping the cover & the heads (like the Victor covers) to enable putting sealant between them and tightening the cover in place better.

Just an afterthought, but maybe you can start w/ the Victor B valley cover and modify that to work w/ the Stage VI heads?
==> http://www.jegs.com/i/Edelbrock/350/7799/10002/-1

I used an indy valley tray and just run a bead of ultra grey sealer along the seam ,worked perfect .

Yep, as said the 129 manifold won't fit the B engine application regardless of what cylinder head is used, because it is too wide.

The P4876337 could be made to work on the B engine/Stage VI combination, but it is not a 4500 flange like the 129 (not sure how important that was) and as said the integral valley tray will be in the wrong location. It shouldn't be too hard to make it work with a different valley pan but since I've never actually worked with that combination it's hard to offer any advice.

Dean it's too bad Summit/others did not tell you the truth about availability but that seems the norm anymore. Truth is, there are 4 of the 129's in Mopar warehouse stock, and if ordered one could be expected to show up quickly.

We were out of stock on 337s too for a short while but at the moment Mopar/Chrysler does have 3 of them on hand if someone wants to place an order.

ok, i know what direction i need to go on this one now, i already have a B indy Dominator manifold, i'll make spacers & my own vally plate & have it welded as a one piece. how thick are the spacers you get with the 440 manifolds to make them fit? they would be the same thickness yeah?

MP RB Stage VI spacers are .850" thick, IIRC.

Dwayne Porter mounted mine to the heads w/ counter-sunk screws to keep them positioned properly while port-matching them to the heads' runners & intake manifold.

i looked on Mancinis' site. i can't find the spacer plates. anyone got a link or part # for these?

I have a set of max wedge spacers that I will never use ( 383 block with 440 manifold ) if you want them or want me to measure them . PM me if interested

The Indy Mod Man intake might work for you. It is RB width and has a built in valley tray. You can order it with std ports or MW ports. It isn't a race manifold but it would work okay with a couple of small Edelbrock carbs.