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Motorcraft 4 Barrel Carb |
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JGRANTAMX
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1703 |
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Interesting info, there is a link from member Trader at the beginning of this thread to Mikes Carburetor parts for 4300 newer type float, I bought one this morning.
J
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6910 |
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So to get that facts corrected.
According to Mike's Carburetor and a Ford mechanic the original 70's nitrophyl floats all absorbed gas over time and sink. The deteriorating floats as per the Ford mechanic came from an aftermarket supplier back in the 80's and they were only in business until the mid 90's. This may have been a local supplier and not into the US. In the mid 90's the floats for these carburetors were no longer manufactured and all supplies basically dried up. They have just started reproducing new floats in the last few years for these carburetors. They are a new formulation of nitrophyl that they developed in the late 70's or early 80's that are so far floaters and not sinkers.
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LakesideRamblin
AMC Addicted Joined: Dec/21/2015 Location: So. California Status: Offline Points: 2694 |
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You did give me good advice, Trader, thank you. I'll be ordering the floats you linked!
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LakesideRamblin
69 Rambler 360 73 Javelin 360 "If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt |
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JGRANTAMX
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1703 |
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From Mike's Carburetor Parts description of the replacement floats. "New 4300 4 barrel plastic float. New. 1969-74 Ford products. Fits the 4300 only, NOT the 4350 and cannot be substituted. These are not nitrophyl, but they are made from a type of plastic. Ethanol ready."
J
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3502 |
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The original intake is a good piece, I would bet that it flows better than something like an Edelbrock Performer or Offy Dual port. The ports probably match the heads & gaskets better than any aftermarket intake. But it is heavy cast iron. Accelerator pump cups are the one problem I've had in my 4300. Black ones, who knows what they are made of, shrink over time & stop sealing. I switched to a blue viton cup & have had great luck, no more problems. Also, if you rebuild a 4300, be aware that it has two needle assemblies ( at least my 70 & 71 do, never worked on a 73), operated off of one float. Both need to be adjusted by the service manual specs. One is high flow, the other low flow. Sort of a clever idea.
Edited by scott - Jun/10/2019 at 4:40pm |
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LakesideRamblin
AMC Addicted Joined: Dec/21/2015 Location: So. California Status: Offline Points: 2694 |
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Much appreciated, Scott. Good info.
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LakesideRamblin
69 Rambler 360 73 Javelin 360 "If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt |
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JGRANTAMX
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1703 |
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Anyone interested in buying a new Mike's Carburetor 4300 float can get one for the same price as Mike's on ebay with free shipping.
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JGRANTAMX
AMC Addicted Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1703 |
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Follow up on the updated floats they have been discontinued anyone know why? I restored my carburetor with one it has not been used yet.
J https://www.carburetor-parts.com/Motorcraft-4300-Float--FL18_p_3527.html?fbclid=IwAR0oP5F3I7hasOvRLln6Vyw0rYWR-Gj5ta8RKm_4qfJyeSgxTQpsIrTbUrc Edited by JGRANTAMX - Oct/21/2021 at 3:46pm |
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ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11543 |
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My guess could be supply chain issue?? Also, can't be too much demand.
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74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
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amxron
AMC Nut Joined: Nov/18/2011 Status: Offline Points: 295 |
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These carbs run a little lean. If you add headers or other aftermarket speed parts you will need to go to bigger jets, 2 to as much as 10 sizes larger.
You can buy jets from Ford, they are not the same as Holleys. All 2 & 4 barrel Motorcraft/Autolite use the same style jets. Goodluck, Ron.
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AMXron
Fleet/Jeep Mgr. Orbit AMC/Jeep 50-1787 |
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