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70gmcjimmy · 03-26-2015, 08:35 PM

You might try reading this page, it wasn't great help on my 2 I-6 engines, but I did learn a little bit about them. Also reportedly the number cast into the block behind the dipstick is the date the block was cast. For instance the one in my '55, which I believe is a 230, has K 9 4 cast there. K is the 11th number of the alphabet so that means November. 9 means the 9th of the month and 4 probably means 1964 but it could mean 1974 but I don't think so since I think it is a 230.

http://www.novaresource.org/codes.htm

Hope this helps. DAC

03-26-2015, 08:35 PM	#5
70gmcjimmy GMCDAC Join Date: Apr 2006 Location: Rapid City, SD Posts: 837	Re: Help Decoding a Inline 6 engine code??? 230 or 292 You might try reading this page, it wasn't great help on my 2 I-6 engines, but I did learn a little bit about them. Also reportedly the number cast into the block behind the dipstick is the date the block was cast. For instance the one in my '55, which I believe is a 230, has K 9 4 cast there. K is the 11th number of the alphabet so that means November. 9 means the 9th of the month and 4 probably means 1964 but it could mean 1974 but I don't think so since I think it is a 230. http://www.novaresource.org/codes.htm Hope this helps. DAC __________________ 1970 GMC K5 Jimmy Custom 4X4 Mom's driver from 1971 to 2001!! Under rebuild! 1972 GMC C2500 Pickup owned since 1979 Needs a rest and refurbish! 1955 GMC 100 2nd design driven almost daily! Rest In Peace Mom. "Dolly" 7/15/23 - 5/18/09 GMC driver for 30 years!