Aftermarket carb on stock 360 manifold
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=100015
Printed Date: Apr/19/2024 at 12:51am
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Topic: Aftermarket carb on stock 360 manifold
Posted By: Paulinpa
Subject: Aftermarket carb on stock 360 manifold
Date Posted: May/15/2019 at 2:50pm
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Hi all I have a 79 CJ7with a 304 and what appears to be a 360 factory four barrel manifold (I just found some pictures in a Jeep forum looks like a spread bore manifold)I need to replace the carburetor which is a holly with something different and have decided on an eldelBrock AVS 2 and just want to make sure it will fit. I am concerned because The AMC manifold does not appear flat if that makes any sense to you. I am used to manifolds having a large flat mounting surface. Any help would be greatly appreciated thanks so much cheers
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Replies:
Posted By: Trader
Date Posted: May/15/2019 at 4:20pm
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The Jeep spread bore manifold does have more taper on it front to back then the car manifold as the engine was angled more (transfer case ...) and the carburetor needed to be level for the floats. The AVS2 does have short float through length, the Truck Avenger is designed for off road use and may be a better choice depending on use. You will need an adapter for either of these two or replace the intake with an aftermarket. |
Posted By: Ken_Parkman
Date Posted: May/15/2019 at 4:51pm
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And adapters are a problem. That spreadbore carb pattern - if it's a later 360 4 bbl - is the 4350 Motorcraft, which is a real orphan. The intake casting number is 3224347 for the late 4bbl intake, and almost nothing fits the carb pattern. It is not the same as a conventional Qjet spreadbore pattern. You might be better off changing to an earlier intake which would work really well on the 304 and a conventional carb would fit. There are big and small port AMC 4bbl intakes with a conventional carb pattern, and they are quite good - just heavy. They are a little hard to find, but usually cheap.
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Posted By: THE MENACE
Date Posted: May/15/2019 at 5:01pm
The AVS 2 is an excellent choice!! The new annular flow primary boosters work awesome and the AVS 2 carbs do have the spring loaded needle and seats so they work great off road!!!!! You can use Edelbrock adapter plate #2732 to install an Edelbrock carb to a factory Jeep 4 barrel intake.
------------- Former Owner of: The Craig Breedlove "AERO AMX" Still Owner: SS/AMX #9 replica (THE BIG MENACE) 70 AMX 416, EFI, Nash 5 speed 70 Javelin 401, 727 (Wife's car) 72 Gremlin Autocross Project. |
Paulinpa wrote:Posted By: Ken_Parkman
Date Posted: May/15/2019 at 7:10pm
| That is an easy way to do it - I didn't know it works, but makes sense. |
Posted By: billd
Date Posted: May/15/2019 at 7:39pm
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Considered a pair of 190x carbs to replace my 1406 carbs which are worn out - literally, old and worn and tons of miles on them (and likely too large) (space an issue in my case so most Holley's out of the question - 8" center to center, one reason I've considered the 190X series) I've read about the annular boosters and what i've read is 100% positive, better throttle response, etc. I suspect you'll be fine with the AVS 2 carb on that engine - makes sense for your use. -------------  http://theamcpages.com" rel="nofollow - http://theamcpages.com http://antique-engines.com" rel="nofollow - http://antique-engines.com |
Posted By: Sonic Silver
Date Posted: May/15/2019 at 7:44pm
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Posted By: billd
Date Posted: May/15/2019 at 8:18pm
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Never looked at the summit carbs - know nothing about them. But like the 4 hole injectors I put in my Eagle, replacing the single hole injectors, the annular design makes total sense to me, better response seems to be the common theme. The QF carbs I was looking at as a pair for the dual quad - old style straight boosters. ------------- http://theamcpages.com" rel="nofollow - http://theamcpages.com http://antique-engines.com" rel="nofollow - http://antique-engines.com |
Posted By: Sonic Silver
Date Posted: May/15/2019 at 9:07pm
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Posted By: billd
Date Posted: May/15/2019 at 9:21pm
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Probably too large physically for my use, then - two of them 8" center to center. Wow, been a while since I worked on that old an Autolite. I think the last time was on a Lincoln engine I rebuilt for a lady. ------------- http://theamcpages.com" rel="nofollow - http://theamcpages.com http://antique-engines.com" rel="nofollow - http://antique-engines.com |
Posted By: nitro-express
Date Posted: Mar/04/2024 at 5:45pm
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Interesting thread so far, and as I also have a 360 with a 3224347, the factory manifold for the Autolite 4350 carb, I was checking the details. First detail I checked was the front to back bias or tilt. The 4347 has taper towards the front of 1 1/4". My measurements were 4 9/16 on the rear and 3 5/16 on the front. I compared it to the Edelbrock Performer and came up with the same 1 1/4" of taper. 5 3/8" and 4 1/8". I'm aware of only one AMC manifold made for the 4350, and according to my measurements, taper should not be an issue, as Edelbrock has sold a bunch of Performer intakes for cars and jeeps. If hood clearance is close, the Performer is higher by 13/16" or almost 1". Trans Dapt makes a nice looking and what looks to be a decent flowing adapter to put a square port carb like a Holley or AVS 2 onto the 4347 manifold. The pn is 2199. The Edelbrock adapter plate #2732 is not the correct spacer. On either edge, at the widest point of the 4350 base, the gasket will only seal by about 1/8". It is close for only a short distance, but IMO, that is not enough gasket. Over time it may fail. It is not a good fit. https://www.hedman.com/product-detail/2199" rel="nofollow - https://www.hedman.com/product-detail/2199 IMO the adapter will likely kill a bit of flow from the carb, my WAG would be about 50 cfm. But when I look at the 4347 intake, it likely doesn't flow well enough for the small loss in the adapter to be noticed. From all accounts, the Autolite 4350 wasn't that good a carb, and a new AVS 2 with an adapter will likely outperform the stock setup.
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