1967 4 barrel with manual trans. According to 1967 service manual vaccum is 12 degrees and mechanical is 19 degrees. Initial timing spec is 12.5. Total looked high. Something wrong with distributer advance?
I think you may have hinted at the answer to my question here ^
The service manual specs in the back of the electrical section are for distributor advance. Distributor degrees moved at specified distributor rpm; and distributor degrees moved for an amount of applied vacuum.
To know what the timing on the engine should be, double the distributor degrees and double the rpm. Add the advance degrees to the initial. This will now be the timing on the engine at the specified rpms.
To check vacuum advance on the engine, you must first establish the timing without vacuum advance.
If you post the full specs from the service manual, or the details of the car, we can be specific. They had different curves for 2bbl and 4bbl, stick shift vs auto, and Hi-perf package. Also sometimes theres minor differences between Plymouth and Dodge. Thats why Halifaxhops asked if you have the number on the distributor.
