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How will it work?

Bigtime

Bigtime

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Hello,
I recently bought an Offenhauser 360* intake identical to the one shown here.
The application is my '65 Coronet 383 [out .030]/727/3.23 [for now] rear gear. A 4.10 gear is planned for the near future.
The engine has a slightly lumpy [no cam card, bought it this way], has headman headers, and electronic ignition.
I plan on using it with a Holley [list 4779 DP]......
The goal is to get good low RPM performance and torque.
Sooooo......how will it work?
Thanks!

offy360.jpg
 
I used one in 1970 on a 413. Old technology. Basically a single plane so low end is not its strong point. Much better intakes out there.
Mike
 
I think one of those was tested in a magazine article where they ran a bunch of intakes on a 383.
It was at or near the bottom of the list.

I’d look for that article on line...... as I recall it was a pretty good read.

Mopar Muscle or Hot Rod as I recall.
 
493 Mike said:
I used one in 1970 on a 413. Old technology. Basically a single plane so low end is not its strong point. Much better intakes out there.
Mike
Click to expand...
I realize that it is old technology, but you did answer my question about the low-end performance. Probably as interested in the nostalgia look as anything else. I really have no intention of hammering the "happy button" routinely. I also have an Edelbrock DP4B that I might try. I have a vintage Edelbrock Tarantula TM6 w/a 600 Edelbrock carb on it now.....any thoughts?.....thanks...
 
PRHeads said:
I think one of those was tested in a magazine article where they ran a bunch of intakes on a 383.
It was at or near the bottom of the list.

I’d look for that article on line...... as I recall it was a pretty good read.

Mopar Muscle or Hot Rod as I recall.
Click to expand...
That was an "intake manifold shootout" piece that was posted by Hot Rod mag. I remember it, and I'll take a look. I'm as interested in nostalgia as anything else. Hell, I'm getting to be a "Geezer" now at 70.......I stopped racing in the mid-80s.
 
I remember that article as well. They tested several single & dual plane manifolds on the same engine, however, if I recall, it was a 440 engine, not a 383. I have an Edelbrock DP4B on my 440 and was curious what the results were for it. From what I remember, the DP4B was one of the best dual planes of those tested and beat several single planes. Of course I could be suffering from senility but that's what I think the results said. In rethinking it, I think my manifold is / was a CH4B. I couldn't find any info about it on Edelbrock's website so I called them. They said the CH4B stood for Chrysler four barrel. They claimed it was exactly the same as the Chrysler Manifold but made of aluminum. :)
 
BSB67 said:
Well that's not correct
Click to expand...
You are probably right! The person I spoke to way back when might have been the mail boy for all I know! Hell, he could have told me anything as there was absolutely no data or specs for my "Edelbrock" intake manifold! One thing is for sure; I sure didn't make it! LOL!
:lol:
 
The goal is to get good low RPM performance and torque.
Sooooo......how will it work?


Like ****

Go with the Edelbrock DP4B if you want off idle Torque and Cruising Low RPM performance on the street say to 5,000 - 5,500 RPMs or so

Weiand Action Plus Dual Plane

Edelbrock Performer

These are all off idle low RPM performance and Torque for the street
 
Last edited:
CH4B and DP4B are basically the same manifold, an early two plane design, ch for chrysler meaning a rb application, the dp for dodge/plymouth for a b block.
Either would be better than the offy. It is a low rise single plane with very short runners. The short runners kill low end, the low rise and awkward runner layout kills top end. To tell the truth, i think your tm6 is better everywhere. I think you would be happier with any of the two-planes mentioned above. Dp4b would work fine.
 
My buddy had a Offy 360 on his 440 Duster. Comp 305 H cam, headers, 3.91. I looked at it. Looked like the flattest manifold I had ever seen. We put a Eddy Performer RPM on it. Picked up .6 in the 1/4. That's correct, 6 tenths in the 1/4. He said the RPM is the greatest thing ever. I said no. Your old intake was worse than a stock piece.
Doug
 
Bigtime said:
Hello,
I recently bought an Offenhauser 360* intake identical to the one shown here.
The application is my '65 Coronet 383 [out .030]/727/3.23 [for now] rear gear. A 4.10 gear is planned for the near future.
The engine has a slightly lumpy [no cam card, bought it this way], has headman headers, and electronic ignition.
I plan on using it with a Holley [list 4779 DP]......
The goal is to get good low RPM performance and torque.
Sooooo......how will it work?
Thanks!

View attachment 1104104
Click to expand...
Depending on how it's built and your stall speed that 750 double pumper will be a bit much. I'd rather use a 3310 vacuum secondary. The 4779 is a great carb, but you probably experience some bogging off the line. I also agree if youre looking for low end torque. Use a dual plane too.
 
I'll agree with the DP4B for all-around, and TM-6 for all out.
I tried one of those offys way back, ended up giving it to a buddy for his motorhome.
 
Was his motor home able to move under its own weight after installation
 
Bee1971 said:
Was his motor home able to move under its own weight after installation
Click to expand...
Yes it was. It had a 65 383 2bbl, He wanted a 4bbl. Problem solved.
 
Both segments were 383
PT2
hotrod.com/articles/hrdp-0801-mopar-intake-manifolds/
PT1
hotrod.com/articles/hrdp-0712-mopar-intake-manifold-comparo/
 
multimopes said:
I remember that article as well. They tested several single & dual plane manifolds on the same engine, however, if I recall, it was a 440 engine, not a 383. I have an Edelbrock DP4B on my 440 and was curious what the results were for it. From what I remember, the DP4B was one of the best dual planes of those tested and beat several single planes. Of course I could be suffering from senility but that's what I think the results said. In rethinking it, I think my manifold is / was a CH4B. I couldn't find any info about it on Edelbrock's website so I called them. They said the CH4B stood for Chrysler four barrel. They claimed it was exactly the same as the Chrysler Manifold but made of aluminum. :)
Click to expand...
DP4B is B block......CH4B is RB......either that also carry the Chrysler part # are rare I'm told. It is my understanding that they these were developed for S/S racing in the 60s.....but.....I could've having a "senior moment" too. Shucks, I may just swap in a 4.10 rear gear, leave my TM6 in place and add either a 750 DP or a 750 Eddy......
 
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