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The optispark distributor which was used on GM LT series engine is on front of engine below water pump
The LT family of engines use a crank-trigger ignition. The distributor cap is located on the front of the engine below the water pump.
It is behind the atarter in the side of the engine block.
Must remove starter to get to it.
In GM trucks or new GM cars, the 8th digit of the VIN # is the Engine.
GM?