My references, which include the '54 resto packs, don't show Z for the trucks. They show X (3100), XA (3600), and XB (3800) as the only suffixes for the regular production 235 truck engine. Mine's an X.
Curt ---- 1953 Chevy 6400, 1957 Chevy 2dr Sedan --"Mediocrity is easy, the good things take time"
