Published October 31, 2026
ZR1 is a special-performance Corvette, not one RPO that means the same thing on every generation. The factory code changes with the engine. This page lists only the codes those cars actually carry, with links to the generation lists.
C4, 1990 to 1995
ZR1 – Special performance package.
LT5 – DOHC, 32-valve 5.7L engine.
Both are on the C4 Corvette RPO codes page.
C6, 2009 to 2013
LS9 – Engine, gas, 8 cylinder, 6.2L, sequential fuel injection, aluminum, high output, intercooler, supercharged.
ZR1 – Performance package, special coupe. Printed that way on the 2012 service-parts list. The 2009 GM RPO list prints ZRI (letter I) for the same package.
Full list: C6 Corvette RPO codes.
C7, 2019
LT5 – Engine, 6.2L (376 ci) supercharged V8, direct and port injection. 2019 ZR1 only.
Full list: C7 Corvette RPO codes.
C8, 2025 on
LT7 – Engine, 5.5L V8, twin turbo. ZR1 and the gasoline engine in the ZR1X, 2025 to 2027.
M1K – Transmission, 8-speed dual clutch. ZR1, 2025 to 2027.
ZTK – ZTK Track Performance Package. ZR1 and ZR1X, 2025 to 2027.
Full list: C8 Corvette RPO codes.
Sources
C4 codes are the published C4 list. C6 LS9 and the ZRI/ZR1 spelling are from GM RPO lists compiled by RPO Archive and the 2012 service-parts list. C7 LT5 is from the 2019 GM order-guide copies cited there. C8 LT7, M1K, and ZTK are from the 2025 through 2027 GM fleet order guides, including the April 10, 2026 2027 Corvette order guide.