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Old 09-11-2005, 22:12   #1 (permalink)
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new manifold?

would be interested in any input. I have recently purchased an Xb gs ute with a 351c. the previous owner has fitted a 465 street avenger to it on the original 4v inlet manifold. I have been advised to change this manifold for an edelbrock. Any ideas? should i do this or scrap the carb instead. The car is driven quite regularly so I'm not looking for big horsepower. thanks.
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Old 09-12-2005, 02:50   #2 (permalink)
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Re: new manifold?

The factory manifolds work pretty well for a driver IMO i wouldnt change it .A performer wont offer any real gains other than weight.A bigger carb wolud work ok,a 600 for a driver or a 750 vac if you want some power too.
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Old 09-12-2005, 03:50   #3 (permalink)
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Re: new manifold?

yea, someone did recommend keeping the manifold and changing the carb. you said a 600, are they a 2 or 4 barrel carb?? sorry, i don't know much about holleys.
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Old 09-12-2005, 04:08   #4 (permalink)
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Re: new manifold?

the carbies he mentioned are both 4 barrels

one thing to watch for is if the carby is spread bore ( front barrels bigger than back ) or square bore ( all barrels the same size ).

your factory manifold will be a spreadbore patern so a 600 or 650 spreadbore vaccum secondaries would be the way to go for an everyday driver.

but then if its going fine with the 465 and the carby is in good nick then you are proberly just as well to keep it. might be more economical ??
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Old 09-12-2005, 08:09   #5 (permalink)
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Re: new manifold?

Quote:
Originally Posted by 351cid
( front barrels bigger than back )

...or, perhaps--depending on where front is on your engine--the other way around! (Primaries small, secondaries large on a spreadbore!)


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Old 09-12-2005, 18:37   #6 (permalink)
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Re: new manifold?

Ford did have stock squarebore manifolds A mate has one on his 302C. Works much better than a spreadbore version.
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Old 09-13-2005, 00:56   #7 (permalink)
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Re: new manifold?

Quote:
Originally Posted by brenx
Ford did have stock squarebore manifolds A mate has one on his 302C. Works much better than a spreadbore version.
How did it work better? I really think with a stock/mild 302/351 either one will work the same. I ran a spreadbore manifold, with square bore adaptor and 600 vac for years, and it work VERY well. Swapped to a ford sqarebore manifold later on and no difference in drivability of performance.
The biggest difference i ever experianced was going to the TFC hirise.
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Old 09-13-2005, 01:38   #8 (permalink)
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Re: new manifold?

The airspeed in the manifold is better through a sqaurebore manifold. Which has also been realised by the aftermarket Ford manufactures.

If you get behind a XC/XD/XE which has a spreadbore manifold when the secondaries kick in, you'll see loads of unburnt fuel. The fuel doesn't mix efficiently. Then you get behind one with a squarebore manifold and the airs cleaner.

I've seen the dyno results on this also. The lowend is better, you don't get a big kick in the pants with a sqaurebore but the end result is a more even spread of power which has a higher peak.

We also had the luck of testing it on a 302 stock and semi stock and saw the benifits on a modified 351. It's the same for carbs. A squarebore just kill a spreadbore. When we did carbs we tested with two 650dp. End result is the car was much nicer to drive with the squarebore.
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Old 09-13-2005, 02:10   #9 (permalink)
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Re: new manifold?

Quote:
Originally Posted by brenx
The airspeed in the manifold is better through a sqaurebore manifold. Which has also been realised by the aftermarket Ford manufactures.

If you get behind a XC/XD/XE which has a spreadbore manifold when the secondaries kick in, you'll see loads of unburnt fuel. The fuel doesn't mix efficiently. Then you get behind one with a squarebore manifold and the airs cleaner.
brenx, why is the airspeed better? If you compare the two manifolds, that come out stanadard, you won't see any difference. Just take a close look at the two. There are identical, except for the carby flange. I bet you a carton that the airspeed is higher on the primaries.
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Old 09-13-2005, 02:17   #10 (permalink)
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Re: new manifold?

Quote:
Originally Posted by xdclevo
brenx, why is the airspeed better? If you compare the two manifolds, that come out stanadard, you won't see any difference. Just take a close look at the two. There are identical, except for the carby flange. I bet you a carton that the airspeed is higher on the primaries.
We did compare it on a standard 302. Squarebore cam out on top. As stated above.
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