Stock HP Exhaust Manifolds: Can They Make High HP / TQ?

[cudabob496]

Thanks for the heads-up.  I have several engine building books but not that one so I will pick it up.  I don't hate headers per se, its just that I like the less rattley & deeper sound manifolds get plus if they're right they are 100% zero maintenance.

Later, Jim

I think in some cases, it comes down to "how bad do you hate to lose a street race". The new Camaros are out looking for me, and I'll make most any
reasonable mod possible to keep my Cuda from being beat, and thus preserve the Mopar honor!

[Road_Runner]

I think in some cases, it comes down to "how bad do you hate to lose a street race". The new Camaros are out looking for me, and I'll make most any
reasonable mod possible to keep my Cuda from being beat, and thus preserve the Mopar honor!

That is all that used to matter to me, at least it did well into my 20's.  After raising two kids and fixing to celebrate my 30th wedding anniversary it just isn't 'everything' anymore.  That said, I'm leaning towards HP manifolds on the Barracuda and going with TTI headers on the Roadrunner.  When I bought the RR in 1974, it already had Hooker Supercomps and the original manifolds in the trunk.  I'm going to talk to a couple of Mopar engine builders around town, decide if I'm building a stock stroke or stroker 318 or 340, pick a HP/TQ goal and go from there.  I'd like 400 or more HP & TQ especially if I go the stroker route so that may need headers to move the extra air, guess I'll see what they say.

Later, Jim

[ragtopdodge]

What heads you running?

You going for 100% stock look?

I think it'd be stupid to run Edelbrocks or Indys with OEM manifolds.  My $0.02.

Some 915s, 906s, or Stealths would be fine ONLY if you're going for stock look.


If you are not going for stock look, then just get some shorties.  Better than OEM log manifolds by far.  Schumacher or Hedman makes decent shorties.

[Road_Runner]

What heads you running?

You going for 100% stock look?

I think it'd be stupid to run Edelbrocks or Indys with OEM manifolds.  My $0.02.

Some 915s, 906s, or Stealths would be fine ONLY if you're going for stock look.


If you are not going for stock look, then just get some shorties.  Better than OEM log manifolds by far.  Schumacher or Hedman makes decent shorties.

Still not 100% sure about my goals, if I can get the performance I want out of a 'stock' looking combo in the Barracuda I'm very inclined to go that route.  My goals for the Roadrunner are evolving.  My plans have been for a 70's period correct highly modified drag car look.  Now I'm thinking more of a level stance, with a more lightly modified look hiding modern improvements.  Don't disagree with trying to hide obviously non-stock heads on an otherwise stock looking build.  My head preference would definitely be the Stealths unless I can get the 906's to flow well enough for whatever build I end up doing.  I guess I'm beginning to value what these cars originally were more & more as I get older & more nostalgic.

Later, Jim

[ragtopdodge]

I'm with you.  Other than headers, I want the underside to "look" somewhat stockish.  Stealth heads definitely and painted intake, OEM valvecovers.  Stock brackets, pulleys.

NO ECU on the firewall!  Hide that thing!

OEM manifolds are also like 30lbs!  Uggh!

[nqkjw]

I'm doing something similar.
I'm currently doing a 1960 Imperial 2 door hardtop with 413.
I want it to be stock appearing but original authentic stock is not my thing.
I'm using a set of longhorn crossram manifolds on the engine with 906 heads but wanted cast iron exhaust manifolds to retain stockish appearance.
I'm using a pair of 440hp manifolds that came off my challenger.
With smallish cam I'm only aiming for a genuine 350hp so I feel the hp manifolds should support this OK.

[brads70]

I'm doing something similar.
I'm currently doing a 1960 Imperial 2 door hardtop with 413.
I want it to be stock appearing but original authentic stock is not my thing.
I'm using a set of longhorn crossram manifolds on the engine with 906 heads but wanted cast iron exhaust manifolds to retain stockish appearance.
I'm using a pair of 440hp manifolds that came off my challenger.
With smallish cam I'm only aiming for a genuine 350hp so I feel the hp manifolds should support this OK.

Love the look of those intakes!  ..... those fuel lines.... they are just for mock up right? Being copper and all?

Sorry just the tech inspector in me coming out!

[nqkjw]

those fuel lines.... they are just for mock up right? Being copper and all?

Sorry just the tech inspector in me coming out!

Haha....out of everyone that's seen this you're the first one that's picked up on it and you did it from a picture!!!
Yeah,they're mock up.I needed fuel lines in place to check for linkage clearance and vice versa.
The real ones will be aluminium.
this whole setup is just mockup on a 440 block.
May look straight forward but you'd be surprised at how much time is invested in making all the mis matched parts fit!!!
Oh...and I'm not a tech inspector but I do scrutineering

[brads70]

Haha....out of everyone that's seen this you're the first one that's picked up on it and you did it from a picture!!!
Yeah,they're mock up.I needed fuel lines in place to check for linkage clearance and vice versa.
The real ones will be aluminium.
this whole setup is just mockup on a 440 block.
May look straight forward but you'd be surprised at how much time is invested in making all the mis matched parts fit!!!
Oh...and I'm not a tech inspector but I do scrutineering

Looks like a bit of work for sure !    Valve cover options would be limited I'd guess.

[nqkjw]

Just want painted tin valve covers original look.
Once again it won't be authentic original but close enough.
Here's the car it's going in.

[brads70]

Nice!