The Engine Suffix Code is stamped on a block pad located immediately forward of the right hand or passenger side cylinder head. The entire engine code contains the assembly plant, month and day along with the engine suffix code. For help go to engine code help or engine decoding FAQ.
Choose Group to View Small Block Engine Suffix Codes

Chevy Small Block Engine Suffix Codes [1-9]

Code Year CID HP BBL Appl
3N 1978 305 145 2 U LG3
3T 1978 350 170 4 L LM1
3X 1978 305 145 2 U LG3
9A 1980 305 155 5 H LG4

 

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