1967 - 1972 F-100 & Larger F-Series Trucks
Discuss the Bumpsides Ford Truck
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Sounds like you do not have enough vacuum. There can be several reasons for this including a lack of flatness in the bottom of the carb or in either side of the spacer. First measure your vacuum at idle.
Haulin' @ss and anything else that will fit in the bed.
Again. Funny you say that. Just got done putting the vacuum guadge on it. At idle it's reading 10. When I give it gas it jumps to 15. If I'm not mistaken it should read zero until I give her gas. Timing was set with the vacuum disconnected and plugged. What next?????
Vacuum gauge is connected to manifold vacuum. If you have power brakes there should be a tree behind the carburetor coming straight from the intake manifold. Have you taken a compression check? That's the first thing to do in a tune up. Like 351 said, the vacuum is very low, it needs to be 15 or more at idle with the stock cam.
Number 8 cylender is reading 65 psi. I don't have the skills to do a rebuild and the time with a 3yr old. So I'll save my pennies and get a crate motor or find a low milage donor. I can easily do an engine swap!!!!! Two days work.
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