1965 non hp log manifolds

[Nathan1965]

I have a 1965 coronet with a 383 (factory 318) and the engine came out a 1970 challenger. it was a 2 bbl engine, and id like to use the factory manifolds.
Is there any fitment issues i should know about, and its a auto as well

 

[33 IMP]

Where is the exhaust flange of the manifolds you want to use? If it's at the rear, it shouldn't be a problem.
Be aware, 62-65 b-bodies mount the engine farther forward than 66-up do. Different k-member. Center dump manifolds might be a problem.
Obviously, you'll need custom pipes made from manifolds back.

 

[Nathan1965]

Where is the exhaust flange of the manifolds you want to use? If it's at the rear, it shouldn't be a problem.
Be aware, 62-65 b-bodies mount the engine farther forward than 66-up do. Different k-member. Center dump manifolds might be a problem.
Obviously, you'll need custom pipes made from manifolds backed t

Where is the exhaust flange of the manifolds you want to use? If it's at the rear, it shouldn't be a problem.
Be aware, 62-65 b-bodies mount the engine farther forward than 66-up do. Different k-member. Center dump manifolds might be a problem.
Obviously, you'll need custom pipes made from manifolds back.

Yeah, they’re at the back of the manifold. I can’t justify paying top dollar for max wedges manifolds

 

[Jeff Peterson]

I would get the Hp style over log, they will fit fine.

 

[33 IMP]

The hp manifolds are clearly better than the logs.
The question is: how much better? 10 hp? 20? Worth the $500 the hp manifolds cost, over the ones he has?
(New repops are $850).

 

[Dave6T4]

I would get the Hp style over log, they will fit fine.

View attachment 1815747

The HP manifolds will fit fine, but you will need custom fabricated head pipes. If you try to use original '67-'70 head pipes, to match manifolds, the engine sits far enough in early B-bodies, that they will interfere with the tierod. Ask me how I know!
There might be a slight loss of power using the original log-type manifolds, but, seat-of-the-pants, I doubt that you would feel it. When I redid my '64 Polara recently, I changed out my HP manifolds for the log style, for a more original look.

 

[Jeff Peterson]

The HP manifolds will fit fine, but you will need custom fabricated head pipes.

TTI makes them

 

[qkcuda]

I knew I had seen a test of the log manifolds versus the HP manifolds. This is a quote from Jim Laroy (IQ52) on A bodies from some dyno testing he did a number of years ago.

"I did a test on a stock low compression 440 making 272 horsepower with the factory log manifolds and switched to hp manifolds and gained 4 horsepower all the way up to 276HP."

I decided to keep the log manifolds on my car and just improve the exhaust system behind them.

 

[RemCharger]

I knew I had seen a test of the log manifolds versus the HP manifolds. This is a quote from Jim Laroy (IQ52) on A bodies from some dyno testing he did a number of years ago.

"I did a test on a stock low compression 440 making 272 horsepower with the factory log manifolds and switched to hp manifolds and gained 4 horsepower all the way up to 276HP."

I decided to keep the log manifolds on my car and just improve the exhaust system behind them.

Certainly would be cool to see that test on a 400hp mill

 

[Nathan1965]

The HP manifolds will fit fine, but you will need custom fabricated head pipes. If you try to use original '67-'70 head pipes, to match manifolds, the engine sits far enough in early B-bodies, that they will interfere with the tierod. Ask me how I know!
There might be a slight loss of power using the original log-type manifolds, but, seat-of-the-pants, I doubt that you would feel it. When I redid my '64 Polara recently, I changed out my HP manifolds for the log style, for a more original look.

so i can use the 1970 challenger manifolds, but i cant use the factory style headpipes? which thats no problem because its going to the exhaust shop when its done

 

[Dave6T4]

I don't t know much about E- bodies, so can't comment on that. I know that when using matching year B-body pipes, they drop straight down from the manifolds and hit the tierod. If the head pipes angle back, they would be OK.