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15 years ago

F620FC - Decodes too: F = Flint, Michigan 6 = Month (June) 20 = Day (June 20) FC = 283 - 8 Cylinder with Powerglide and 4bbl. The last piece of the puzzle would be a casting number block. Again, there is NO definitive way to tell if the engine is original to the car...

lhamdist

15 years ago

thank you for responding here is the engine number that we have. F620FC once decoded will we be able to tell if its the original?

pontiacsd

15 years ago

Unlike Pontiac, Chevrolet did not stamp engine blocks with a corresponding matching vehicle vin. The best you can do is a properly date coded block and plant coded block. For 57 engines were stamped with a serial number which broke down to Unit Number, Plant (F=Flint MI, T=Tonawanda, New York), Model Year and finally Engine Type. If you have the engine post the block numbers and we can help decode it, you can find the numbers on a pad, front right hand side of the block behind the water pump.