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What Carburetor for Factory 4-bbl? |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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What will fit is the question....Square Bore Holley like a O-1850 from the old days, Edelbrock AFB/Performer for a Holley Flange or a Motorcraft 4300.....
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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javelinjason
AMC Apprentice Joined: May/20/2010 Location: Bangor, PA Status: Offline Points: 91 |
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Thanks for all the input. I'm not too experienced with carburetors, and they can be intimidating to me. I was born into the fuel injection age. The plan was to rebuild the stock Motorcraft 4300, but if I decided to go aftermarket, I wasn't sure what would bolt on the factory manifold.
I've seen various spacers and adapters available. I forget what the factory insulator thickness is now... it's been a few weeks since I took it off and measured it. I know TransDapt makes spacers, and I think that's the route I want to go (versus the stock insulator). The end goal here is to rebuild or improve the carburetor while keeping the factory cowl induction air cleaner. Maybe one day I'll switch it over to the Holley fuel injection.... but that will be a long way off. |
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-1972 Javelin SST
-1973 Javelin -1973 Javelin AMX PC |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3557 |
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You shouldn't need an adapter. Good carb ( at least to me) for a driver would either be an Edelbrock or a Summit. More of a turn key than a Holley. About how thick of a gasket/spacer are you looking for? Paper thin or one of the thick factory gasket isolators with grommets on 4 corners? I can understand being intimidated with a carb in th OBD era. Crack a book, there's plenty. |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7969 |
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javelinjason
AMC Apprentice Joined: May/20/2010 Location: Bangor, PA Status: Offline Points: 91 |
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I'll look into the Summit brand. Thanks!
As for the spacer, I understand and appreciate the intention of the factory insulator. It was there to prevent fuel boiling in the bowls. I'd go with the stock height, just in the phenolic material. TransDapt 2446 or similar may do the trick. |
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-1972 Javelin SST
-1973 Javelin -1973 Javelin AMX PC |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7969 |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6916 |
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When you get the spacer, and I have not used that one, just ensure it is the proper ID's and align with the bores of the carburetor. Nothing like having one put on and the secondaries hang after going WOT.
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javelinjason
AMC Apprentice Joined: May/20/2010 Location: Bangor, PA Status: Offline Points: 91 |
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They make an open square model too, no butterfly holes. I wasn't sure if that would cause turbulence issues or not though. ???
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-1972 Javelin SST
-1973 Javelin -1973 Javelin AMX PC |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3557 |
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I'd try to find a 4 hole myself.
Edited by Heavy 488 - Feb/11/2020 at 11:30am |
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javelinjason
AMC Apprentice Joined: May/20/2010 Location: Bangor, PA Status: Offline Points: 91 |
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Thanks again for all the input. We decided to get a Summit 500 CFM M08500VS and a 1/2" Summit brand phenolic spacer. It's a stock engine, so I feel this will be comparable to the Motorcraft 4300 which flows 431 CFM. This will be fun!
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-1972 Javelin SST
-1973 Javelin -1973 Javelin AMX PC |
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