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C8 C is Chevrolet 8 means 1978...
this is only a partial vin that all you will find on the frames. i dont know how to decode it or even the order. the c part could stand for chevy or it could be for 96" or 106" conventional cab or cummins. the 8 could be year or 80 85 serries, 3 ton or even it was made in japan. the f could mean it was made in flint, mi. or 54" alum tilt. 3 could be chassis cab so taking an edjumated guess i would say chevy 78 cab and chassis then idk.since your vin is ckl3381120780 C8F318920 C ChevroletK 4 wheel driveL 350 engine3 30 series 1 ton3 cab and chassis8 19781 made in Oshawa