Mystery Exhaust manifolds for Use 0n a 1970 383 Cuda

[Ariovistus]

Hello,

I have a friend who has a 1970 383 Plymouth Cuda. He has the correct High performance manifolds, but He found a set of Mopar Manifolds that have no casting Numbers. They are both center dump and they look like they will flow better than the original manifolds. Has anyone seen these and can they fit in an E-Body? He does not like headers, but would like to use a cast Iron Manifold that flows good. Appreciate Your assistance.

 

[DetMatt1]

I haven’t seen any regular production Mopar part without a casting number on them so. If I had to guess and assuming they are cast iron?, I’d say they're truck and someone has ground them smooth. What makes you think they’d flow better than HP manifolds? What’s the inside diameter at the downpipe?

 

[Chryco Psycho]

They look like the ones on my big block trucks

 

[Cuda Hunter]

Looks like my truck manifolds.

 

[70chall440]

Pretty sure they are not going to fit an E body, especially on the drivers side.

 

[fasjac]

Probably early 70’s motor home or truck aftermarket??? It does appear that someone tried to make them pretty at onetime.

 

[Bobby Sixkiller]

Yep they are for a pickup. Probably aftermarket

 

[Ariovistus]

Thank You all for Your assistance. My friend is new to the Mopar/E Body world. He does not like headers. I heard about Accurate LTD. Do They make a better flowing exhaust than the Hp Manifolds? He had His motor rebuilt and the mechanic told Him He would lose 40 Horsepower if He did not run headers. Appreciate all of Your inputs.

 

[Ariovistus]

I haven’t seen any regular production Mopar part without a casting number on them so. If I had to guess and assuming they are cast iron?, I’d say they're truck and someone has ground them smooth. What makes you think they’d flow better than HP manifolds? What’s the inside diameter at the downpipe?

Hi DeMatt1, They are cast iron. He thinks because They look like a Ram's Horn that They would flow better. The inside diameter is only 2 inches at the downpipe. He used to run Chevys and is new to the Mopar/E Body world. Thank You for Your Input.

 

[DetMatt1]

Hi DeMatt1, They are cast iron. He thinks because They look like a Ram's Horn that They would flow better. The inside diameter is only 2 inches at the downpipe. He used to run Chevys and is new to the Mopar/E Body world. Thank You for Your Input.

I would guess that those will not flow as good as stock HP manifolds. What’s been done to the engine?

 

[Ariovistus]

The Motor has stock 906 heads with New valves, Factory rocker arms and Pushrods, 9.6 compression forged Wiseco .030 pistons, a Comp Cams 227/241 @0.50 with 486 int/473 exh, New valve springs, Factory intake with a quick fuel 650 carb vacuum secondaries/Electric choke, Cloyes True roller double roller timing chain, ARP bolts, factory steel crank, and a Flowkooler water pump.

 

[DetMatt1]

Unfortunately this is one of those circumstances where you can’t have your cake and eat it too.
The headers are going to give you better performance than any stock manifold. So imo he needs to abandon any thought of using incorrect cast manifolds because not only will it not look right but none will perform better than the factory HP ones designed for these cars or use headers.
The sad thing is that even with headers on a bad ass big block built to your friends specs you’ll still probably only barely keep up with today’s modern performance cars....I’d stick with the HP manifolds and enjoy the car for what it is.

 

[Ariovistus]

I am trying to talk him into some TTI Shorty headers. He also just unveiled a Gear Vendors Overdrive/Underdrive for a 3.55 Limited slip!Thank You for Your inputs.

 

[Bobby Sixkiller]

If I had a gear vendor I’d go with 3.91s. But that’s just me.

 

[challenger6pak]

You can have stock hp manifolds smoothed out on the insides for better flow. Extrude Hone does them.

https://extrudehone.com

 

[Ariovistus]

If I had a gear vendor I’d go with 3.91s. But that’s just me.

Bobby, He has 3.55 already and Purchased a Gear vendors for that application. But I agree with You! Thank You for Your Input!

 

[Ariovistus]

You can have stock hp manifolds smoothed out on the insides for better flow. Extrude Hone does them.

Extrude Hone - Shaping, Finishing , and Deburring Solutions

Challenger6pak, My friend and I have heard of Extrude Hone. Thank You for Your Input.

 

[i_taz]

Don't let anyone discourage you....

 

[Ariovistus]

Don't let anyone discourage you....

i-Taz! Thanks for the Encouragement! My Friend feels Uplifted! I am amazed! I always like the Classics More than the New Muscle, although I respect it. I guess I am one of those Stuck in the 70's Guys! You Rock!!\m/ \m/

 

[Cody Goode]

Pretty sure they are not going to fit an E body, especially on the drivers side.

Does anything? Lol