1964 Sbc Vacuum Diagram. If during a test drive the engine seems a little sluggish you can move the timing up two degrees to 6 BEFORE If the engine clatters when you accelerate move the timing down towards the 0 by two degrees. If the vacuum advance control unit is not fully pulled in at idle it will be somewhere in its mid-range and it will fluctuate and vary the timing.
Reattach the vacuum hose to the distributor. Yes then you visit to the right site. If the vacuum advance control unit is not fully pulled in at idle it will be somewhere in its mid-range and it will fluctuate and vary the timing.
Need vacuum diagram for a 1964 cadillac - Answered by a verified Classic Car Mechanic.
The timing setting given is the most common for the 327. Chevrolet Service News Vol 433 1971. Vacuum level 2 below numerically less than the manifold vacuum present at idle. I use to have to replace my distributor advance diaphragm because of fuel contamination.
