correct exhaust manifolds

[auxiliarytwin]

Hello,

I have single exhaust on my 72 Charger 400 as well as the original exhaust manifolds in place.  It originally came with a 2brl (now 4brl).  If I were to switch to dual exhaust, are there different exhaust manifolds I would need, or did they use the same ones for both single and duel exhaust?

[auxiliarytwin]

I can locate no comprehensive list of manifold cast numbers for after 1971.

Does anyone have insight here?

[ODZKing]

No one says you can't have dual exhaust with your existing manifolds.
Some where on the TTI or Accurate site is exhaust manifold listings for Mopars.
But if I understand what you are saying, 400 HP manifolds should be the same as my 73.
3751067 (L) 3751069 (R)
Casting numbers are similar but a couple #s off 068/071.  Pic below

[firefighter3931]

Typically the 2bbl low performance engines used a "log" style manifold which is different from the 4bbl HP style exhaust manifolds. The 4bbl manifolds are much better with increased flow and scavenging. That being said, you can still run a dual exhaust system with a std 2bbl manifold as long as you can find the correct head pipes....or you could have something built at a muffler shop.


Ron