Performance differances b/t intakes?

[RustyJeep]

Was there a flow/performance differance between the stock 4bbl spreadbore intake, or the AMC Javelin stock squarebore intake?? I know this is a little far out, but I just picked up a squarebore intake and was wondering?

[jeepjake]

Uh...., I didn't know that AMC ever had a spreadbore manifold, all the 4bbl's that I've taken off off jeeps, javelins and AMX's have been square bore?

Sell that 80lb hunk O' iron and get a Performer!

[RustyJeep]

Aren't the 4bbl intake on these Jeeps spreadbore?? The motorcraft 4350 is a spreadbore carb I thought. Anyways, I got it for free, so I couldn't pass it up.

[Crazy_Jeepman]

<BLOCKQUOTE>quote:</font><HR>Uh...., I didn't know that AMC ever had a spreadbore manifold, all the 4bbl's that I've taken off off jeeps, javelins and AMX's have been square bore?<HR></BLOCKQUOTE>
Yup lots of spreadbores were used such as the motorcraft 4350.
The square bore I believe does not move as much CFMs when when wide open as the spreadbore does. As far as performance I doubt you will ever notice the differance. If by the way you have a spreadbore intake there are adapters to run your square bore on it, just incase you didn't know that.

[RustyJeep]

Yeah, it's the stock squarebore intake that I am talkin about...shrug

[Ralph]

The late-sixties AMX's, Rebels, and other muscle car types had Carter AFB carburetors and so had square-bore manifolds. There's no inherent superiority between intakes just because of their bolt pattern. The square-bore pattern was actually called a "Holley" bolt pattern for a long time because that sort of meant you could bolt on a higher performance carburetor. But a lot of great carbs like the Carter Thermoquad, Rochester Quadarajet, and even several Holleys had spread-bore bolt patterns.

[RustyJeep]

I figured there was not much of a differance, but I just wanted to make sure one didn't flow better than the other.

[jeepbob]

The big problem you may have with the older intake is that it may be for the low deck height motors and can be a real pain to seal (like almost impossible without multiple gaskets) and there also may not be an oil fill tube.

[RustyJeep]

Hmm...this flashed in my mind, but I said hey it's free. It has the oil filler tube, though. I'll have to examine it a little closer.