Learn how to decode Small Block Chevy engine suffix codes, their significance, and common variations to identify performance levels effectively.. 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.Chevy Small Block Engine Suffix Codes.
Small Block Chevy Suffix Codes: TJT - TXB GM body designation. All these are identified here. Quickly, A = Chevelle, F = Camaro, X = Nova. If you're looking at the engine code - this is already known. If you're looking at the casting # information and it mentions 3970010 "A/F/X/Y/B".. basically this means "it's used in everything", whereas if it simply states "Y". this means Corvette.. For 1958-65 Chevrolet & (this chart also includes 1965 396 engines) The suffix code for 6 cylinder engines can be found stamped on a pad near the distributor. Suffix codes for small block V8's are stamped on a pad located on the front of the passenger side cylinder head as shown in this example: An example: (T03I9QA) T=Tonowanda (assembly plant) 03=March (month) 19=19th (day) QA=400hp 409.