Big Block Engine Forum - spread-or square-bore?

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spread-or square-bore?

Printed From: The Ford Torino Page
Category: Powertrain Specific Forum
Forum Name: Big Block Engine Forum
Forum Description: 429 and 460 engines
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=1907
Printed Date: 26-March-2026 at 3:54PM
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com

Topic: spread-or square-bore?

Posted By: Kit Sullivan
Subject: spread-or square-bore?
Date Posted: 19-January-2009 at 11:53PM

On a '75 460, is the factory intake a spread-bore or a square-bore design?

Also, how much of an improvement over the factory manifold is there if I switch to an aftermarket unit, like an 'Edlebrock Performer'?

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"I'm too old to grow up now!"

Replies:

Posted By: castillo
Date Posted: 30-January-2009 at 1:10PM

Square.. Ask me how I know.. I used a 74 460(D4LF) carb on my 76 torino 351w w/weiand intake.. I would believe the 75 was the same.. As far as the swap on the 351w the carb had a choke stove & electric choke assist but the weiand intake didn't have a provision for the choke stove.. The weiand intake also had a generic mount pattern for the throttle bracket..I only used 1 bolt to attach original bracket.. To be quit honest I believe this carb was to large for the engine as I never did get the engine to run real good..You can see the set-up if you look in the classified ads under Pics of 76 parts car. Also on page 2.. Its differant than the 76 parts car ad.. Its pics of 76 parts car

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My dad told me 2 things.. Always drive FORDS and never marry women with names like CHERRY,PEACHES and LEMON

Posted By: Torinogts73c
Date Posted: 10-April-2009 at 3:30AM

75'S went to a spreadbore 4350 motorcraft carb, which ultimately got replaced by Holley's from an early TSB from Ford. Also some 74 460's had Thermoquads on them, I have one in my stash unfortunately is no good. The Ford fix was a kit that had a small spacer and the Holley carb to replace the 4350. 4350's had a bad problem with a plug by the filter inlet blowing out and dumping gas all over!!

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Gary 73 Gran Torino Sport 351CJ,17 Mustang Ecoboost,18 Lincoln MKZ Reserve, Ford Ranger parts hauler

"Never complain Never explain" Henry Ford