Re: Late Ignition timing - Vacuum Gauge Display
Galaxz posted good info. To expand things a bit, I'll mention what is done sometimes when your running a bigger cam in your car but it also works with a stock cam. Connect your vacuum gage to the intake manifold and disconnect & plug the line to the distributor. Also connect your timing light. While the engine is running, slowly advance the timing until you get the highest vacuum reading then back off the timing 1in of vacuum on the gage. Ck to see where the timing is with your timing light. Go for a road test and see if it spark knocks. If it does, back it off 2* and drive it again. This method gets your engine to run at its best without being stuck to factory specs.