Replacing Carburetor
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Replacing Carburetor
I have a 1975 F100 with a 302cid and am in need of a carb rebuild. After reading several posts Im realizing that the best move is to just get a replacement carburetor. Does any have an suggestions on the best replacement carb ? Should I upgrade to a 600cfm ? Should I replace the intake also to gain more performance ? Looking for suggestions and see if anyone else has made this upgarde ? Thanks Im a newbie to the post but you guys have lots of good insight.
Laughing Gas
Joined: Sep 2003
Posts: 968
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From: Corbett, Oregon
I have to agree with UTfball. A properly sized and tuned Holley works as well as any other make of carb.
My preference for a relatively stock small block is the Holley List #4548. This was a Ford service part, usually with a Ford part number of D0PF-9510-xx. It is a 450 cfm carb, which is about the size of the older Ford 4100 4 barrel carbs. I have found the 4548's to have better all around driveability and superior fuel economy than a 600 cfm carb, again, on a stock small block.
Hope this helps.
Roger Carter
My preference for a relatively stock small block is the Holley List #4548. This was a Ford service part, usually with a Ford part number of D0PF-9510-xx. It is a 450 cfm carb, which is about the size of the older Ford 4100 4 barrel carbs. I have found the 4548's to have better all around driveability and superior fuel economy than a 600 cfm carb, again, on a stock small block.
Hope this helps.
Roger Carter
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Thanks for the advice. I was looking at the Edelbrock and Holley but think I will look go with the Holley after your post. How much of a difference in performance should I expect by swapping out the intake also ? Does the carburertor and intake need to be the same manufacturer ?
Laughing Gas
Joined: Sep 2003
Posts: 968
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From: Corbett, Oregon
Again, I agree with Ben. I have always had success with Edelbrock Intakes. You will probably want to use an Edelbrock Performer intake for your application (stock long block). If weight isnt a concern a stock 289/302 cast iton 4V intake from the mid 60's would be a good choice. Price for either, used, is about the same.
Another thought, and I am not trying to throw rocks at Edelbrock Carbs. The Edelbrock carb design does not lend itself to a Ford application as well as a Holley does. Throttle linkage, AT kickdown, fuel inlet location, air cleaner, all require additional work to allow then to fit on most Fords. Just a heads up and food for thought.
Good Luck
Roger Carter
Another thought, and I am not trying to throw rocks at Edelbrock Carbs. The Edelbrock carb design does not lend itself to a Ford application as well as a Holley does. Throttle linkage, AT kickdown, fuel inlet location, air cleaner, all require additional work to allow then to fit on most Fords. Just a heads up and food for thought.
Good Luck
Roger Carter
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From: Northeast LA
I went with the 500 cfm Holley 4412 2 barrel. It bolted right on in place of the Motorcraft 2150 and had all the linkage for the tranny kickdown already installed on it. I chose it also because it will work with future upgrades I have planned like a new cam and some E7 heads. I can always use an adapter to put it on a 4 barrel intake also, so I don't have to spend another $300 for another new carb later on when I do the other upgrades.
Holley 0-4412S - Holley Model 2300 Carburetors - summitracing.com
Holley 0-4412S - Holley Model 2300 Carburetors - summitracing.com
Senior User
Joined: Dec 2007
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From: Colorado
I have always had good luck with the Holley Avenger series carbs and Edelbrock Performer intake combos. I put the Holley 670 cfm street avenger w/manual choke and performer intake on my '83 Mustang, 302, mildly modified, and it ran awesome. The Holley had externally adjustable floats that were a dream to work with.
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Postmaster
Joined: Aug 2005
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From: Gadsden Purchase
I went with the 500 cfm Holley 4412 2 barrel.
Holley 0-4412S - Holley Model 2300 Carburetors - summitracing.com
Holley 0-4412S - Holley Model 2300 Carburetors - summitracing.com
Is it zinc or aluminum? :)
Alvin in AZ
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From: East Flat Rock NC
jeff1975
You may really want to think of what ( RPM range ) you want this intake to work best at!
Intakes are made for lots of different ( RPM ranges ).
P.S. I also lean towards Holleys, I like the Classic gold, because the zinc finsh oxidizing!
And the zinc finsh gets dull in places, I like to keep carbs on the small side and jet up when needed!
Wally Womack
You may really want to think of what ( RPM range ) you want this intake to work best at!
Intakes are made for lots of different ( RPM ranges ).
P.S. I also lean towards Holleys, I like the Classic gold, because the zinc finsh oxidizing!
And the zinc finsh gets dull in places, I like to keep carbs on the small side and jet up when needed!
Wally Womack
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Jsutton, Did you notice a big difference in performance ? Did you replace your intake also ? I was looking at the 4412 and think thats the way i may go but was wondering what the cost would be to make it a 4 barrel down the road if i decide to upgrade.
Posting Guru
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From: Northeast LA
My decision on the 4412 was mainly what is going to be dependable and could I use now and later! I love it and I'm very happy with my choice, but like I said earlier if I would have had the extra money I would have gotten the 4 barrel combo.
Laughing Gas
Joined: Sep 2003
Posts: 968
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From: Corbett, Oregon
Be aware that a 2 barrel carb is rated differently than a 4 barrel, meaning that the CFM rating of a 2V is not equal to a 4V carb.
Typically, a 2 barrel is rated at 3" vacuum and a 4 barrel is rated at 1.5". In other words, a 500 CFM 2 barrel flows much more than a 500 CFM 4 barrel. I use a rule of thumb that a 2 barrel CFM X 1.4 = 4 barrel CFM. (500 X 1.4 = 700 CFM). Again, this is my rule of thumb.
I have ALWAYS found that when sizing a carb for a stock, or near stock, application, smaller is better. This applies to driviability, economy and most of all, user satisfaction.
Hope this is helpful.
Roger Carter
Typically, a 2 barrel is rated at 3" vacuum and a 4 barrel is rated at 1.5". In other words, a 500 CFM 2 barrel flows much more than a 500 CFM 4 barrel. I use a rule of thumb that a 2 barrel CFM X 1.4 = 4 barrel CFM. (500 X 1.4 = 700 CFM). Again, this is my rule of thumb.
I have ALWAYS found that when sizing a carb for a stock, or near stock, application, smaller is better. This applies to driviability, economy and most of all, user satisfaction.
Hope this is helpful.
Roger Carter
Posting Guru
Joined: Dec 2007
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From: London, Ontario Canada
i would go with a edelbrock 600 cfm performer 4 barrel, the nice thing with a edelbrock is no fuel leaks, theres only one gasket and its above the fuel level, and i bolted mine right out of the box and turned the key and instant start! no tuning, there might be some tuning once it hits the road of course, but it idles like a dream, and its made in the U.S.A. and not china! or Mexico! i am unsure of holleys build location i hope its in the U.S.A.! anyways you can buy new or buy a reman from edelbrock for 249.99 that has electric choke or go with manual for less, and i had no problems installing it on my 302, and i have had experience with holleys going out of tune and are a pain in the rear end! go with a edelbrock carb and intake and hear that all edelbrock power roar! thats my two cents, any one else use a edelbrock carb before?
Lead Driver
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I like weiend intakes myself. Get an intake with an Idle-5000 rpms or so powerband. And if you get a cam, you do want the powerbands to match, brand does not affect this. As far as carbs go. Somewhere around 500 cfm should do nice. If you wheel alot id get the truck avenger. IMHO, ive never heard of any intake adding 15hp to any stock engine. if you were to only change your intake on your 302 you would net probly 3-4 hp, and maybe .2 mpg. But, combine an intake with a carb, cam and exaust, and that intake will add 15 hp maybe. Especially if you have some compression and headwork. Just remember this. Everything you do to an engine, is influenced by everything else.