Low vacuum

Perfromance and Technical discussions about C3 Corvettes
greggome
Junior Member
Junior Member
Posts: 15
Joined: Aug 26th, 2014 9:44 pm
Tell us about your Corvette: 1968 327/350 just out of 20 years storage. starting the process of restoring what I can (not frame off).

Low vacuum

Post by greggome » Oct 8th, 2014 8:21 pm

My 68 327 is pulling 10 on my vacuum gauge. I have done all the checks I can think of to locate any possible leaks including propane and carb cleaner as will as smoke. Still cant find the problem. vacuum gauge suggests late valve timing or leak at intake manifold. What is late valve timing and how does it occur? It has also been suggested to me to replace the carburetor as a solution. Would a carb problem cause a vacuum issue (there are no leaks at the base to manifold that I can find)?