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post #1 of (permalink) Old 12-05-2002, 06:26 PM Thread Starter
 
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factory 4bbrl intake for a 360 HELP

i picked up a 4 barrel intake today at a junk yard. i ask the guy if it was a spread bore he said the back holes are bigger than the front ones so i guessed it was. wrong, it is a 4bbrl but what is it? can you get a adapter for a strait bore? how well dose this flow compaired to a spread?

duke
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post #2 of (permalink) Old 12-05-2002, 06:56 PM
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Re: factory 4bbrl intake for a 360 HELP

It's a spreadbore {rochester}. You can get a square bore adapter at a parts store.
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post #3 of (permalink) Old 12-05-2002, 07:55 PM
 
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Re: factory 4bbrl intake for a 360 HELP

I think the factory AMC 4 bbl carbs were Motorcraft, they had 2 small primary holes, and 2 larger secondary holes, I think the factory manifolds need an adapter to fit a Holley, or Qjet.

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post #4 of (permalink) Old 12-05-2002, 08:54 PM Thread Starter
 
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Re: factory 4bbrl intake for a 360 HELP

yes it has two holes in the front that are smaller than the back ones. i didnt look at that close. i went to a part store on the way an got a adapter for a qjet. then i got to the shop an nothing fit. i didnt know there were two kinds of spread bores or maybe three. is the motocraft the same as a rodchester, i look at edelbrock web page they talk a thermel quad. would that be the same as motocraft or rodchester?

duke


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post #5 of (permalink) Old 12-05-2002, 09:31 PM
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Re: factory 4bbrl intake for a 360 HELP

If I remember correctly, then Square Bore only means that it is equal distance around (kinda like if you draw a square around all the holes), and that a Spread Bore would have two holes outside of that square (so that if you drew lines around outside, it would appear as a triangle with the top cut off).

I don't think that the hole size has much to do with it, just the relation of the front set to the rear.


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post #6 of (permalink) Old 12-05-2002, 09:39 PM
 
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Re: factory 4bbrl intake for a 360 HELP

depending on the year of the intake i think that amc did use the thermo quad for a while [img]images/graemlins/frown.gif[/img]
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post #7 of (permalink) Old 12-06-2002, 12:15 PM
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Re: factory 4bbrl intake for a 360 HELP

I bought a adapter plate to put a squarebore on a 401 spreadbore. There were 2 types of spreadbores if my memory serves me correctly, the ford and the roch. type. They do make adapters for both.
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