Just like the title says. My carb is producing zero vacuum at any rpm. I have 12 psi at the PVC do I know the intake is making it but I can't get any at the fitting for the dizzy.
Any ideas before I tear down the carb for a possibly unnecessary rebuild?
Yes you have manifold vacuum. However the load o matic advance system uses a combo of manifold and ventri vacuum. Possible causes of no vacuum are clogged carb ports and or the SCV isn’t working. See below link for a good article on how the Load O Matic advance system works and its parts. Good luck
If you want to install a distributor with centrifugal advance & vacuum advance there is a tech article in the forum tech section. viewtopic.php?f=99&t=76821
Doing this modification will let you use your present carburetor with the mods done & reap the benefits of a later distributor.
However if your engine has the small 1/4 oil pump drive that will limit your distributor choice.
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