Offenhauser Six Pack Intake

Anyone ever run an Offy Six Pack intake on a big block?

Any good? Better than Eddy?

Is the carb spacing, and intake height, the same as stock Six Pack intake manifold?

Are you talking about a real early 1950s/1960 era three two barrel intake or did they make a later one that will mount Holley 2300 type two barrel carbs on ? can you show us a picture? that will help sped things up a bunch

large base Rochester 2GC carbs, B engine no RB.

My opinion of Offy stuff is that it was great, 40 years ago.

Today? Nostalgia.

Was it a single plane with a plenum divider like the Offy 360 intake?
What I remember about the early GM tri power carbs. was they where pretty small flowing carbs.

Looks like a dual plane to me pic found on internet, not my manifold.

I'd like to put one on my 65 300 Vert.

That looks like the stock Eddy intake for Holley carbs. not for the GM Rochester two barrel small bolt pattern

Wrong pic, sorry

[img:left]http://www.offyparts.com/popup_image.php/pID/137[/img]

the intake in question looks the same as the previous photos...

Might be time for some new spectacles.

I tried to post an image but it didn't show up. Let me try again. The other photos look to be the Eddy... [img]Offy 440 6 intake[/img]

Yes, this is the intake in the link previously provided...

[img]http://www.offyparts.com/popup_image.php/pID/137[/img]

Anyway, I have one NOS, was wondering if it was worth running? If not will probably sell it here on Moparts if anyone is interested...

I have one like in the pic Supercuda posted above...Thought I had a pic but can't seem to find it...
No real world experience with it as I haven't installed it on anything. I know you do need to get the Rochester 2 jets that are set up to be ran as 3 deuce carbs. The fuel inlets on the tops of the typical 2 jets is different and they will not fit together inline. I have the intake and carbs in a tote out in the shop. If you need pics I can get some...
The pics below show the difference in the 2 styles of carbs... the 3 deuce one exits out the side...

Ah, very interesting indeed...

This one?

Kevin

The early (pre 1962) GM Rochester 2GC Tri power carbs. where smaller CFM than the later ones is what I was told back in the day
That intake being a 180 degree single plane with a plenum divider might not work well, maybe it would

That's it Kevin...

It looks like the same design philosophy as my Weiand 7503 4-barrel Poly intake. As said above, it's a single plane with a divider down the middle. It's a lot easier to cast than a dual plane intake.

I was probably still in college when the last competitive Offy intake was introduced. They are nowadays strictly nostalgia.

Rochester 2-barrel carbs are easy to find. They have two different bases. The larger bases are preferable as they have the same interior dimensions as a 500 Holley, but GM rated them 435 cfm. That's equivalent to 308 cfm in a four barrel.

The smaller base max carb size would be 390 cfm, as a four barrel it would be 275cfm.

The 1965 and earlier Pontiac 389s and smaller used a smaller center carb and two larger outboard carbs. The 1966 used three big base carbs, and gained power.

IMHO the best place for this particular intake would be in a cruiser or street rod. An Edelbrock Perf RPM and suitable carb would probably be 50hp above this one.
As this intake is low rise it may fit under a hood better, another thought.

To OP: Clean it up, take really good pictures and put it on Ebay. It may take a while to sell, but there is a buyer out there for that intake.

R.

I would be interested

I just checked Summit and they list a Offy B motor 3 Duce intake for $350.

I went through some of my nostalgia rags and couldn't find that intake for the RB motor.

http://www.offyparts.com/product_info.php/cPath/1_9/products_id/276

https://www.summitracing.com/parts/ofy-5207/overview/

Info is skinny on it though

I have this one

Looks like this one with different adapters for the carbs.

http://www.offyparts.com/product_info.php/cPath/1_9/products_id/277

Dyno shoot out

http://www.hotrod.com/articles/hrdp-0712-mopar-intake-manifold-comparo/

I'd leave those intakes for (rat or) street rods like a 30's Plymouth high boy or Dodge truck.
The Edelbrocks offerings are a lot better.