To Fire on the right order
Depends on engine and manufacturer.
what engine do you have in your impala?
The timing for a 460 Ford engine is 14 degrees before top dead center. The engine should idle at about 600 rpm.
0 TDC. Top dead center
8-10 deg. before top dead center
It is 0 degrees at top dead center ( TDC ) With engine warm.
6 to 8 degrees before top dead center.
0 TDC / Top dead center.
Should be 12 degrees before top dead center
It is 6 degrees before top dead center.
Should be 12 degrees before top dead center
ignition timing is the time when your spark plugs fires the gas in the engine cylenders usually tdc or top dead center on the #1 cylender