Carb too big for engine?
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
You have different problems, but I believe they are all still carb related. The third gear problem could be combination of too big carb and secondaries opening too soon. Stalling at idle, idle circuit problems, hesitation off idle could be accelerator pump/squirters. First thing I'd do is pull it off and check out the RTV issue. Could have some where it doesn't belong. Regasket it properly. Since you have a 4V manifold a smaller 500-600 carb would be a good move if you wish to spend the money. You will have better throttle response for sure. Not going to advise between Holley and Edelbrock, I've had good and bad issues with both.
Cargo Master
Joined: Dec 2004
Posts: 3,362
Likes: 22
From: Florence, SC
If the carburetor you have on it now has mechanical secondaries, that could be causing your problems. You will want a carburetor with vacuum secondaries.
I would like to make a better suggestion for a replacement carburetor...
Try to find a Motorcraft 4180 4V carburetor. They were found on '83-'85 Mustangs with the 5.0 and F150s/Broncos with the 351 H.O. motor. This carburetor will have all the emissions connections you will need, and with annular primaries, is a much better carburetor than either the Holley or Edelbrock.
I would like to make a better suggestion for a replacement carburetor...
Try to find a Motorcraft 4180 4V carburetor. They were found on '83-'85 Mustangs with the 5.0 and F150s/Broncos with the 351 H.O. motor. This carburetor will have all the emissions connections you will need, and with annular primaries, is a much better carburetor than either the Holley or Edelbrock.
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New User
Joined: Oct 2010
Posts: 21
Likes: 0
Before I order a new carb, I need to find out what year engine I have. Please help me out and look here.
https://www.ford-trucks.com/forums/1...ml#post9476241
I was told it was an 87 302, but the plugs that fit it were used in the late 60s- early 70's 302s. I was told to count the bolts on the valve covers, and there are 5. Any help?
https://www.ford-trucks.com/forums/1...ml#post9476241
I was told it was an 87 302, but the plugs that fit it were used in the late 60s- early 70's 302s. I was told to count the bolts on the valve covers, and there are 5. Any help?
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
Ford went to the the smaller 14mm plugs in 1975. Before that they were 18mm. If engine has been rebuilt, block casting code and heads could be different. No real way to tell without pulling the head to see it's casting number which is underneath next to intake manifold. Valve covers will have same bolt pattern till you get back to the 292-312 engine if I remember correctly.
Post Fiend
Joined: Nov 2008
Posts: 23,849
Likes: 20
From: McKenzie River
True info.......once you find the casting no......PM a gentleman named Conanski, in the 87-96 F-series forum or in the small block V8 forum, he can ID the block very quickly, also... he is a fountain of knowledge on the 302 in general.
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New User
Joined: Oct 2010
Posts: 21
Likes: 0
Found the cast number. 0 C5AE 6015E
Now i'll have to find this Conanski fellow.
EDIT: I just looked it up and apparently I have a 65 289 Hi-Po. So the dude that sold me this lied. Great. Is this engine any good?
Now i'll have to find this Conanski fellow.
EDIT: I just looked it up and apparently I have a 65 289 Hi-Po. So the dude that sold me this lied. Great. Is this engine any good?
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
A true 289 Hi-Po is rare. Look on the head in front of the valve cover. If the number is 19-20-21, they are Hi-Po heads. Worth a good bit of money to someone restoring a K code Mustang.
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New User
Joined: Oct 2010
Posts: 21
Likes: 0
I will just assume that it isn't a hi-po. Next question. When looking for a carb or any parts for this engine, do I look for 289 specific? I heard the 289 is pretty much the same as a 302, just a different stroke. So would intake manifolds, carbs, headers for a 302 fit the 289 or net necessarily?
Thanks for the patience with my newb questions.
Thanks for the patience with my newb questions.
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Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
Anything on the outside of the engine will work. All the more reason for a smaller carb. But check those numbers and the number on the intake if it's it still stock. Stranger things have happened, you might get lucky.
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 59
No reason you need a brand new carb. You have a 600 cfm carb which is just fine, just buy a rebuild kit and clean it up. All the while check what jets and needles you have and if needed purchase a Strip Kit which has jets, needles and needles and seats.
Josh
Josh
Certified Thread Hijacker
Joined: Aug 2001
Posts: 14,441
Likes: 59
If the carburetor you have on it now has mechanical secondaries, that could be causing your problems. You will want a carburetor with vacuum secondaries.
I would like to make a better suggestion for a replacement carburetor...
Try to find a Motorcraft 4180 4V carburetor. They were found on '83-'85 Mustangs with the 5.0 and F150s/Broncos with the 351 H.O. motor. This carburetor will have all the emissions connections you will need, and with annular primaries, is a much better carburetor than either the Holley or Edelbrock.
I would like to make a better suggestion for a replacement carburetor...
Try to find a Motorcraft 4180 4V carburetor. They were found on '83-'85 Mustangs with the 5.0 and F150s/Broncos with the 351 H.O. motor. This carburetor will have all the emissions connections you will need, and with annular primaries, is a much better carburetor than either the Holley or Edelbrock.
Josh
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New User
Joined: Oct 2010
Posts: 21
Likes: 0
