25th Limited Edition (internal designation for the Pace Car package)

Years 1976, 1978 Models 2 Factory citations 1

Also described as Medalist package

Documented applications

Corvette (C3)

1978 Factory-verified

No separate price/count; factory kit confirms RPO Z78 — "Z78 Limited Edition Corvette Quick-Spec" (p.21), model 1YZ87/Z78

GM Heritage factory kit — 1978 Chevrolet Corvette, p.21.

Nova / Chevy II

1976 Single-source

This page aggregates every documented appearance of Z78 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.