P3690982 Weiand Six Pack Tunnel Ram

FABO Member Photos item created by mosleyme, Mar 16, 2019

General Description

Mopar part number P3690982 (discontinued). Originally designed by Mopar / Weiand and purpose built for Super Stock racing.

Intended for this car:

Cool picture found on Facebook, mild build with ported 452 heads, stock carbs and a 509 cam:

More info here: Weiand 6 Pack Manifold Comments

I bought one off E-bay that had never been used and sent it to F&B Performance for modifications to convert it to port EFI:

Here is a comparison of this intake to a Edelbrock RPM so you can see the difference in runner length and volume.

A few pictures of the heads... "mildly" ported Edelbrock RPM heads, 75cc chambers.

Here are some pictures from a guy in Canada named Don Dulmage who prototyped a 2x4 top in wood then had it cast in Aluminum. DOn DulmaGE

Back from powder coating:
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mosleyme, Mar 16, 2019

Biomedtechguy, Garrett Ellison, A dart and 2 others like this.

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btw, what's the brass insert in the center of the lower part of the plenum for?

synergyperf, Jan 3, 2020
1. vacuum fitting
  
  mosleyme, Jan 3, 2020
  
  Biomedtechguy likes this.
I love this! I have the 4500 flange lid on one of these manifolds. I'm thinking of doing an EFI conversion for my project as well. Have you gotten any driving time or numbers on this setup yet?

synergyperf, Jan 3, 2020
1. nope, project stalled the last few years due to family issues
  
  mosleyme, Jan 3, 2020
Whoaa!Dude gnarly!

Derrick Kidwell, Mar 21, 2019
What heads are those? The (ported) exhaust ports are huge!
Very nice craftmanship!

stixx, Mar 20, 2019
1. Ported Edelbrock RPM heads, I added a few pictures at the end.
  
  mosleyme, Mar 20, 2019
  
  stixx likes this.
Wow, does that idle on all six barrels? That is the six pack setup of dreams! Based on the EFI converted T-rams I have seen, would I be correct in thinking it have a very broad rpm band with the short runners and smallish plenum with the injectors located at the port window? Getting the fuel out of the air column until it gets to the port makes them act like a whole different animal...

Garrett Ellison, Mar 17, 2019
1. We will find out... I plan to fire it this summer. The air for the idle is based on the stop adjustment for the center throttle body and the IAC which you see on the front throttle body. It is progressive, the center opens almost half way then the outers start to open.
  
  mosleyme, Mar 17, 2019
  
  Biomedtechguy and Garrett Ellison like this.
2. All the fuel is controlled via map in the EFI controller. The runners are actually longer than a traditional tunnel ram and the length was "tuned" by Chryslers engineers based on stroke and piston speed of the 440. I assume it will be quite broad and the EFI will make it more so. The factory six packs were rated at 1350 cfm; the top plate was opened up quite a bit, this throttle set up is rated at 1900 cfm. One giant six bladed throttle valve.
  
  mosleyme, Mar 17, 2019
  
  Garrett Ellison likes this.
3. I'm going to add a picture at the end comparing this intake to a Edelbrock RPM so you can see the difference in runner length and volume.
  
  mosleyme, Mar 17, 2019
  
  Biomedtechguy and Garrett Ellison like this.
Awesome!

A408Cuda, Mar 17, 2019

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