carb adapter plates.....?

[71fordkid]

I've been lookin around for carbs on craigslist. all i can find are 4bbls... I have a 2 bbl intake on my truck. i know they make adapters so you can put a 4 bbl carb on a 2 bbl intake.

Will putting a 4 bbl carb on a 2 bbl manifold make any differance performance wise, or will it just guzzle more gas?

the motor is a 70's 302.

[JMcTurnan]

The only time 4bbl really make a difference is when you put your foot down enough and the 4 barrels open. But most street is just 2bbl oppened. But yes it will guzzle gas, but it will also make it have how should I say this, i dont call it performance. But more power. Or you could just get your hand on a 600 cfm 2bbl.

[iamthewreckingcrew]

I wouldn't waste my time or money on trying to adapt a 4bbl carb to a 2bbl manifold. I don't see how you would gain anything except a lighter wallet.

If you really want to change to 4bbl, just find a decent used 4 bbl intake.

[71fordkid]

So not worth it?

Its not that i want to go to a 4 bbl, i just cant find one used on craigslist, and most of the carbs in the junkyard are broken/taken apart, or 4 bbls.

[fordman]

so you are wanting a good 2bbl carb is that the problem?

[71fordkid]

yes. i have a stock 5120 or whatever. ive re-built it a couple times, and want a fresh start.

Im actually trying to fix a problem i have... it doesnt matter if the motor is warm or cold, or what kind of gas i have in it. when i push the throttle down and release it, the truck stays revved up for about 3 or 4 seconds before returning to idle.

[fordman]

lets see what everyone has to say about fixing your old one before i decide if i want to sell my extra good carb.

[JMcTurnan]

If you have rebuilt it it probably just needs adjustments. Save up get a good 2bbl, edelbrock or something. The 2bbl-4bbl adapters work almost as good as the 4bbl intake. Don't let them fool you, but eh, id rather have the bbl intake. But you can find yourself a good 2bbl carb for like 200 bucks.

[iamthewreckingcrew]

The 2bbl-4bbl adapters work almost as good as the 4bbl intake.

What information or experience do you base this on?

[ToughOldFord]

I wouldn't mess with the adapters myself, it's just a micky-mouse way to improperly install a 4bbl on the wrong manifold.

Replacement carbs are still available for these trucks, any local parts store can order you one. And I see Rock Auto has them for $148. I'm sure Holl*y still makes the 2bbl if you want to go that route.

Your problem doesn't sound to difficult though. Check that you don't have a too small or weak throttle return spring. If that's not it then disconnect the linkage at the carb then start the truck and manually open the carb and then let it go. If it snaps right back to idle then your problem is in your linkage, sticking, binding, etc. If the problem still exists without the linkage hookup I'ld look at the throttle of the carb itself to see if it's sticking.

[Redcap]

If you have rebuilt it it probably just needs adjustments. Save up get a good 2bbl, edelbrock or something. The 2bbl-4bbl adapters work almost as good as the 4bbl intake. Don't let them fool you, but eh, id rather have the bbl intake. But you can find yourself a good 2bbl carb for like 200 bucks.

You really don't have a clue.

[72Highboy]

Your problem doesn't sound to difficult though. Check that you don't have a too small or weak throttle return spring. If that's not it then disconnect the linkage at the carb then start the truck and manually open the carb and then let it go. If it snaps right back to idle then your problem is in your linkage, sticking, binding, etc. If the problem still exists without the linkage hookup I'ld look at the throttle of the carb itself to see if it's sticking.

I got a weak spring or missing spring and mine does that too or untill I pull up on the gas peddle with my foot. I would go with what ToughOldFord said.

[71fordkid]

Checked all that already. good tight return spring, and the linkage snaps right back with or without the pedal connected.

[JMcTurnan]

I have put those carb adapter plates on probably 4-5 vehicles, they work pretty good. Not as good as the 4bbl intake, but it does work.

[JMcTurnan]

I wouldn't mess with the adapters myself, it's just a micky-mouse way to improperly install a 4bbl on the wrong manifold.

Replacement carbs are still available for these trucks, any local parts store can order you one. And I see Rock Auto has them for $148. I'm sure Holl*y still makes the 2bbl if you want to go that route.

Your problem doesn't sound to difficult though. Check that you don't have a too small or weak throttle return spring. If that's not it then disconnect the linkage at the carb then start the truck and manually open the carb and then let it go. If it snaps right back to idle then your problem is in your linkage, sticking, binding, etc. If the problem still exists without the linkage hookup I'ld look at the throttle of the carb itself to see if it's sticking.

Hes 100% right, because my spring is slightly week, which in idle it adds about 300-400 more rpm. Which it sticks a little.