Due to site software problems, no PMs and no uploads, so just text

From a built 2.3T short block that I've been saving for a rainy day:

Engineering number: RZ-E3ZE-etc

Stamped: FM629232

FWIW: my first 2.3T, many years ago, was an '86 Xr4Ti WP1BP80W5GM664507​Mike