4Bbl Offenhouser intake on 2.8 v6 - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 01-29-2003 Thread Starter
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Question 4Bbl Offenhouser intake on 2.8 v6

I was wondering if anyone knows anything about the Offenhouser 4Bbl intake. I have an early 2.8 v6 engine(I assume it was from a Mustang II), that has this intake on it. I assume it was aftermarket but wasn't sure. Any info would be appreciated. Thanx in advance !

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post #2 of 11 (permalink) Old 01-29-2003
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Indeed, the Offenhauser 4-bbl. intake is a rare and highly sought-after performance part for the 2.8Litre V6s!

That intake, along with a Holley or Edelbrock carb (390-400cfm is the recommendation) will net you a very noticeable performance increase, and when driven conservatively, your gas mileage won't suffer as much as you might think.

Offenhauser also made a 4-bbl. intake for the 2.3 4-cyl. I'm looking for both of these intakes at the moment, one for my Mustang II (2.3), and the other for my dad's 76 Capri (2.8)

You've got a rare find there, you could keep it and take advantage of the performance increases that it'll offer, or you can sell it for a good bit of cash.
post #3 of 11 (permalink) Old 02-01-2003 Thread Starter
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RE: 74stang2togo

Thanx for the info ! I actually just took the engine with that intake out of my 84 Ranger. Someone had changed engines in it and didn't inform me when I bought it.Cost me a couple flywheels and starters.
Anyway, now I have a clue as to what I have here. I thought it might be somewhere along those lines. Thanx again !

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post #4 of 11 (permalink) Old 02-06-2003
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Glad I could be of help!
post #5 of 11 (permalink) Old 03-05-2003
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I sold a complete race prepped 2.8 with the offy intake and hooker headers for a Mustang II. I posted it months ago and no one bought it. I even had 4 sets of NOS gaskets for each. If I run across any more I will grabem for you guys.

Phillip
1965 Ford Mustang Convertible
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post #6 of 11 (permalink) Old 03-31-2003
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I would like to have that intake. Or if anyone else has one they want to sell.

thaks
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post #7 of 11 (permalink) Old 03-31-2003
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Quote:
Originally posted by carguy65
I posted it months ago and no one bought it. I even had 4 sets of NOS gaskets for each. If I run across any more I will grabem for you guys.
Well, at the time, I was waaay too broke to afford it.

I do appreciate the offer to grab up any you find though! (I can afford one now, and I'm actually gonna need one in the not too distant future)
post #8 of 11 (permalink) Old 03-03-2010
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I just pick up the that intake and the carb off some guy in Maryland for $300!
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post #9 of 11 (permalink) Old 03-09-2010
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Uh, they are still available and so are the gasket sets. Check Summit for the gaskets and OffyParts for the manifold and water neck!
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For the guys that actually have these manifolds and matching water neck - what in the blazes is the correct size fitting for the threaded port on top of the neck? A 5/8 compression thread is really close, but it's just a hair too large for the port.
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Offenhauser 4bbl Dual Plane 2.8L V6 13.92 at 101MPH

Hi Guys,
I had a 1976 Mercury (Ford of Europe) Capri II Le Cat Black S with the Offenhauser Dual Plane 4BBL manifold, a 390CFM Holley 4bbl, Norris ground European Ford Cam Blank (my dad was a Ford VP and could get things not available to the public), Aluminum degreeableTiming gears, Ported heads (by me, they crack so keep some handy), and aluma-coated headers.
This car was fast, 13.92 at 101 MPH was the best pass I ever made at Carlsbad Raceway.
The German 4 speed was great for road racing, but weak at the drags...I kept a spare 4 speed in the garage thanks to Pick-A-Part $35. price .
This engine made awesome power from about 2800 RPM to 7200 RPM where I would shift before it fell off or would float the valves.
As for the Offenhauser manifold, its unique in design because the 2.8 Liter engine is a 60 degree V6. The "square flange" Holley 4 bbl is literally wider than the intake manifold.
Offenhauser designed a GOOD manifold which offered high velocity dual plane ports within the small available space between the heads.
This design required the manifold to be a two piece design where the lower section IS BOLTED TO THE HEADS WITH BOLTS INSIDE THE MANIFOLD! Yes inside the manifold. Always use LOCTITE on these bolts. The upper half of the manifold then covers these bolts and has enough height to allow the 4bbl linkage to clear the valve covers. Weird, but it works very well.
This engine is easily able to produce 200 HP and is about the size of a beer keg.
The closest performance match I have found was the power of my 5 speed SHO Yamaha powered Taurus.
Hope you enjoy your Offy motor and smoke some V8's along the way.
13.92CapriII
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