[ChevLoRay]

Since diesel engines are compression ignition, not spark ignition, the fuel injection system is the timing device. If you have a carburetor on a diesel, and you try to kill the engine.....how's that going to happen? You have to shut off the fuel flow, or it will continue to run until it runs out of fuel. A carburetor just can't efficiently stop fuel from entering into the manifold and an engine that has the high compression of a diesel, will continue to pull the fuel into the cylinders with the high vacuum created by the design of the engine.

If Rudolph Diesel designed it with an injection system, then they will have injection systems. GM (Detroit) diesel engines used 45mm N-type injectors that were controlled by a cam. That cam is what controlled the timing of the fuel as it was injected into the cylinder. They didn't have carburetors.

My truck data book for '69 doesn't list a diesel engine as an option. For example, when you bought a 50-series truck, you got a gas engine truck or you got a diesel engine truck. For instance, a 50-series diesel could be either a 4-53 OR a 478. As for dual stack vs single stacks....the CD50 got a single stack (option N12 for $47.35); the CG50 got dual stacks (option N13, for 96.85). CD50's had the 4-53; the CG50's had the 478 V-6.