Either the cam gear or distributor gear are completely worn out or the more probable. The gear on the distributor is installed using a roll pin. It's possible this is worn out and broken.
Selling a 1977 chevy silverado classic
NO.
4x9
If by "still fire" you mean if it will start, it depends on how far off the timing is. If it is not too far off, the engine will start but miss badly and the timing will have to be re-set. Otherwise, the engine will just crank but not start. You can check the timing by finding Top Dead Center on the #1 spark plug and remove the distributer cap to see if the rotor is pointung to the #1 spark plug wire tower. If it is not pointing correcly, you can loosen the hold-down bolt on the distributer and manually rotate it. Once the engine starts and warms up, you can then slowly rotate the distributer clockwise and counter-clockwise until you get the best "purr" of the engine. For a more precise setting, use a timing gun to set the timing. If by "still fire" you mean the spark plugs stilll fire, yes they will if there is nothing wrong with the firing system. If you do not get a spark or get a weak spark, you will have to check the plug wires and all components, including the coil.
which fuse goes to the tailights on a 1977 Chevy silverado
Try MOTORLIT.COM for wiring diagrams
Is Dist. turning? Voltage tester start at one end or the other and make sure there's power. Wire to coil grounded. Pickup in distributer. Electrical is always interesting.
Roughly 5000 pounds stock. 5700 with lift and mud tires
Fuel economy is an important aspect in motor vehicles. The general miles per gallon that a 1977 Chevy Silverado gets combined is 15.
Points, condenser, cap, rotor, plugs, wires, air, fuel, and oil filters.
Spark plug wires go from the distributer to the spark plugs which are located just below the valve covers between the exaust ports.
1 - 5 - 4 - 2 - 6 - 3 - 7 - 8 The distributor rotor turns COUNTERCLOCKWISE