Intake swap

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Originally Posted by NTFDAY

I'm convinced it's the manifold Chevy copied and used on the 67 Z28.

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I don't think so Ken. The Offenhauser 360, single-plane design allows all 8 cylinders to see each other, plus all the manifold volume and all venturis of the carburetor.
The Z-28 manifold was a 180, dual-plane design that allows only 4 cylinders to see each other, plus only half the intake manifold volume and only the left or right side venturis of the carburetor.

You'll notice that all OEM carbureted motors have used the 180 design from the factory. That's because that particular design works best from idle to 4500/5000 rpm's, generally the limit for a factory stock cam. A larger runner 180 intake, such as the Weiand 8016 Stealth, 300-36 Holley or Edelbrock Performer RPM will make more power under curve from idle to 6000 than any other manifold design, including 360 single-plane designs in my experience.

Urban legend says that Edelbrock copied the Chevrolet Z-28 design to make the RPM and that Weiand and Holley followed suit with their copies of the 180-degree, dual-plane design .

It is of no consequence here, but one of the prettiest motors I ever saw was a 460 Ford with a Weiand Stealth intake and a large X huge Holley double pumper (the original Stealth, not one of the current Stealths which are a watered-down design).

Of course, I could be wrong. :(


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Every single plane manifold I've seen has an open plenum and the Offy 360º I have in the garage and the Offy 360º dual quad I have are both split plenum.

Does anyone here have access to an early 55/56 sbc head so they can measure the distance from the center of the manifold bolt hole to the bottm of the casting that would be in the lifter galley?

As a follow up on previously mentioned work, all up grades are complete and truck starts and runs great. I upgraded the heads to '57 283 heads which are 9 1/2 to 1 compression and had them ported to match the Typhoon manifold. I used the demon carb as it was out of the box only had to adjust idle air. I also installed a mini starter aluminum oil pan and front cover, mechanical fuel pump, fuel pressure regulator and reworked the steering and exhaust.

that looks real purdy!
i see you have a fuel pressure gauge on the regulator whats the other gauge you can see?
thanks for the follow up report
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That is an oil pressure gauge. I don't trust the electric gauge.

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Originally Posted by TomJ

That is an oil pressure gauge. I don't trust the electric gauge.

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where do you get a feed for that from-thought the oil outlets were at the back of the block or down by the oil filter?

The epitome of bling - wow, nice..

That looks really nice! How's it run now?

There is a little 1/8 pipe plug on the front of the right lifter galley. 40ford it runs much better than it did, idles better, leaves from a standstill great and shifts smooth.