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.
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.
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.
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.
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.
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.
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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A mate has one on his 302C. Works much better than a spreadbore version.
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