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 Select Suffix Group #* - B* C* - CZZ D* - FZZ G* - KZZ L* - SZZ T* - TZZ U* - ZZZ 262, 265, 267 302, 305 or 307 327 350 400 ALL (very big)

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