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Well, the engine runs very fast with the new carburetor. It works fine, but there is no vacuum advance, and the increase in fuel/air makes the engine idle as though it is going down the freeway. I had to try. I decided to use the parts from the new carb to rebuild the old carb. Here is how the old carb's pump arm is connected:
This is where the gas was coming through. You can see that gas in the float bowl would go right through the top of the plunger seal:
Here is how the plunger looks on the new carb:
To remove the plunger, you just push it all the way down and tap it out through the bottom. To put the plunger back in, use a twelve point socket that just fits around the outside of the plug, and tap the bottom back in with a hammer. Here are the new and old plungers side-by-side:
There was an extra piece on the new carburetor that appears to protect the spring from shifting to the side when compressed. I liked that feature, so I put this on the old carburetor:
It turns out that the correct Carter carburetor for a 1963 L head engine is a Carter number 3487S. I have no idea why the bolt is sticking up. Probably when the head was rebuilt or replaced, the wrong bolt was used. This is at the base of the carburetor:
The number on the side is misleading. I have no idea what it signifies. The new carburetor I got looks like it is number 4207S, but I can find no reference to this anywhere. The only thing I know is that the carburetors are quite similar in many ways. Here is the base of the new carburetor:
There are 5 parts to this article:
Part 1
Part 2
Part 3
Part 4
Part 5
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