maximum flow stock exhaust manifolds

[sigmfsk]

Here's some info that I wrote on BBC
www.bluesbrotherscentral.com/forum/topic/2053-c-body-headers/#entry105680
regarding my guess on the best flowing stock exhaust manifolds that would fit a 74-77 c-body monaco:

Here:
www.scribd.com/doc/24470110/B-RB-ENGINE
this document:

PN P4007910, Bulletin #2, August, 1980
Race Bulletin Tune-Up Tip
361-383-400
413-426W-440
B-RB Engine
Racing Manual

on page 16 says
> The best cast iron exhaust manifolds produced for the b-rb engines
> were used on the 1962-1964 max. wedge engines, but they are no
> longer available. The next best exhaust manifolds are the ones used on
> the 1968-1970, 383-440 Road Runnder, Charger, Super Bee, GTX, R/T
> high performance packages. These manifolds, PN 2806898 right and
> 2843991 left will not fit into every car or mate up to all exhaust systems
> without custom modifications.

The above race document shows that the best were the max-wedge manifolds, but they were more like headers.



You can get reproductions of them:

chucker54.stores.yahoo.net/mamaxwema.html


So for "normal" looking manifolds, the document above continues:
> The next best exhaust manifolds are the ones used on the 1968-1970,
> 383-440 Road Runnder, Charger, Super Bee, GTX, R/T high
> performance packages.
> These manifolds, PN 2806898 right and 2843991 left

But they don't specifically talk about C-bodies (because nobody really hot-rods a huge c-body).

Per
www.cbodydrydock.com/forum_viewtopic.php?14.20584
> 4) The left manifold for a C-Body 440 HP is unique to that vehicle while the right is shared with B & E-Bodies

So I looked in my hollander interchange manual for any c-body that used the
PN 2806898 right
manifold and found
588[R]
dodge pass. '67-69, 8-440, 375 HP
dodge pass. '68-69 8-383, 4BC
dodge pass. '69 8-440, 390HP

so I then looked for the corresponding c-body left manifold for those years and found
'67 8-440, 375HP: 591[L]
'68 8-440, 375HP: 630[L]
'69 8-440, 375HP: 630[L]
'68 8-383, 4BC: 630[L]
'69 8-383, 4BC: 630[L]

591[L] is part number 2843248
630[L] is part number 2863408 / 2951217

I couldn't find much on 2843248, but I did find a lot of good stuff about
2863408 / 2951217

They are good high performance drivers manifolds for c-bodies. The ...1217 is basically the same as ...3408, but with additions for a heat stove.

Here are two good pages on them - with pics:
www.cbodydrydock.com/forum_viewtopic.php?5.84985
www.cbodydrydock.com/forum_viewtopic.php?5.78192

So I looked around for manifolds with part numbers:
2806898
2863408

but it turns out that almost nobody calls them by their part number. They call them by their casting number - which is different.

This chart
www.mopar1.us/exhaustmanifolds.html
shows that I'm looking for casting numbers
2806900
2863409
respectively. So people sell these manifolds, calling them "part number", when they really mean "casting number".

Here's the set I collected, and subsequently sold to AZ Blues:

[legendaryacura8]

What size are the "collectors" on those manifolds? The 2806898 2863408? Just wondering what a good size exhaust setup would be running these manifolds? Also, AZ Blues, did you install these? If so, were there any clearance issues?

[spanks79]

Once agin thanks Art. I notice from this thread

bluesmobiles.proboards.com/thread/1285/maximum-flow-stock-exhaust-manifolds

That you planned on using these manifolds



Which is interesting, because they are listed as fitting earlier c bodies. If this is true then that opens up the possibility of using other manifolds including these from Year One.

www.yearone.com/Product/1966-74-a-b-e-body/hp689s

Even though not listed for c body the right is a 2806900, the left is listed as 2843992 but looks to have a similar out put as the 2863409. I plan on building custom exhaust, so slight differences in output location are ok. The year one parts are expensive, but come with all the hardware and end up being a one stop shop so in the end it may be a viable option.

[spanks79]

Ok, I made a decision and a purchase so it should be interesting to see how this turns out.

Arthur had planned on using these manifolds



Casting # 2806900 and 2863408

Then I suggested that if those work then maybe the reproduction manifolds year one makes for A B and E bodies will work.
The year one right side is a 2806900 and the left is a 2843992. So the right is good but what about the left.

Forgive my scribbling but see if you get the idea



I attempted to show the difference between the 2863408 (c body) and the 2843992 (a,b,e body).

On the 2863408 the exhaust exits between cylinders 5 and 7, on the 2843992 the exhaust exits behind #7

I actually think either could be made to work but it will be much tighter with the 2843992.

Here are some pics of my NC car with a 400 and log manifolds in place. I tried to show the exhaust exit of the 2843992



More scribbling. Looking straight down, I was trying to figure out what direction the exhaust pipe would go. I think i am going to shoot for inboard of the torsion bar and in front of the shift linkage. Keep in mind the steering shaft and shift linkage skid plate is missing in this picture. Also that is all the crap you need to work around with headers.



So make your own decision but I think either could work and I think that is good news to have a new reproduction manifold that would work. That opens up some options over searching for difficult to find parts.


So what I did was the following, since I liked the exhaust exit of the 2863408 and they can still be found somewhat easily I called Year One and asked if they would sell me just the right side 2806900 and they did! So then I purchased this off eBay.



All told I got HP manifolds and a complete new hardware kit shipped to me for $360 with a year one promo code, I feel like this is a good deal. The hardware kit was $55 and on the used market the 2863408 go for around $125-$150 on line and most 2806900 go for around $200+ on the web if you can find them.

[sigmfsk]

The 74-77 c-body details area is for info on how 74-77 c-body cars came originally, and the
dodge monaco stuff / 74-77 c-body details /exhaust manifolds
discussion expanded into several different performance ugprade areas.

I move many of the recent posts from that details thread into three threads in the "performance and engineering modifications" area:
store bought headers
custom headers
maximum flow stock exhaust manifolds

And I add this post to the bottom of each thread (so that each shows up under "new threads").

[sigmfsk]

Nov 25, 2013 22:31:11 GMT -5 spanks79 said:

Ok, I made a decision and a purchase so it should be interesting to see how this turns out.
...
All told I got HP manifolds and a complete new hardware kit shipped to me for $360 with a year one promo code, I feel like this is a good deal.

Great info, Spanks! I love the pics and details. I have a good feeling about your purchase!