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**oldwagon** · 06-23-2018, 05:51 PM

This number, FO504UH, is stamped on the block in a 67 GMC that I have. Does anyone know of a website that has info on the GM 6's or could someone let me know how to decode it?

06-23-2018, 05:51 PM	#1
oldwagon Registered User Join Date: Feb 2003 Location: Mulvane, Ks. Posts: 754	Engine coding This number, FO504UH, is stamped on the block in a 67 GMC that I have. Does anyone know of a website that has info on the GM 6's or could someone let me know how to decode it?