Original 1990-1991-1992-1993 Chevrolet Corvette RPO LT5 5.7L V8 DOHC Service Manual Supplement. This manual has been prepared as a supplement to the 1990 through 1993 Corvette Service Manuals. It provides the latest information required to service the LT5 engine. Whenever it becomes necessary to refer to sections not listed in this supplement, or when minor component differences between model years need to be referenced, refer to the appropriate Service Manual.