The firing order of the Chevy 366 big block truck engine is 1-8-4-3-6-5-7-2 Rotor turns clockwise. Click the link and you will see a diagram of a 1982 Chevy 350 V8 which is exactly the same as the 366.
Chevrolet Firing Order 18436572
It is at the rear of the engine and has the plug wires coming out of it.
It depends on the firing order of the engine
To add, this is a 5.7 v8 engine.
driver side 1357 passengerside 2468..
If your car has the V6 the distributor is in the space between the heads ad the bell housing end of the engine. If your car has the 4 cylinder engine the distributor is below the intake manifold on the bell housing end of the motor. If it is a distributor-less engine the ignition control module is where the distributor would have been. Either way you can follow the spark plug wires to it.
Plug wires in wrong order, distributor out of sync,Plug wires in wrong order, distributor out of sync,
Need to know what year and engine size.
It would be really helpful to know which of the 3 engines installed in this van, you have. So go here: http://autorepair.about.com/library/firing_orders/bl-chevrolet-firing-91.htm and pick the correct engine.
Bad plug wires or distributor cap is tracking and firing cylinders in wrong order
18436572
You need to look for the firing order for your specific engine. That's the order you place the plug wires in. Make sure the rotation of the distributor matches the firing order.