2bbl to 4bbl ?
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2bbl to 4bbl ?
I’ve got a 1984 F250 351W 2bbl. The owner before me had cracked the cast iron water inlet on the manifold. I’ve recently come across a 4bbl manifold and carb that matches my engine and also came off of a F250. I’ve started installing the manifold and carb and found that there are many more vacuum ports on the manifold and more connections on the carb than I had on the 2bbl. The 4bbl setup didn’t come with any vacuum lines attached and I’m not sure where some of the connections go. For example there is a connection on the carb housing that comes out above the choke housing, where would this connect? What kind of vacuum controls which components on the carb? Are there are different levels of vacuum depending on where you draw from on the manifold? I am a novice with this and could use any advice. Is there such a thing as a vacuum line schematic?
Last edited by TigerDan; Nov 29, 2005 at 08:10 AM.
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There are vacuum schematics, usually pasted to the hood or core support in the car/truck in question. What year is the 4bbl manifold?
Smog and other stuff can vary widely by year, especially in the '70s and '80s.
Try here. I saw the reference to it by doing a google search for "vacuum schematic".
http://www.motorlit.com/
Smog and other stuff can vary widely by year, especially in the '70s and '80s.
Try here. I saw the reference to it by doing a google search for "vacuum schematic".
http://www.motorlit.com/
