1990 Chevrolet Astro Submodel: Base; Engine: 4.3L V6; EngineCode: LB4; EngineVIN: Z; with High Output; Without Service Port;. 1990 Chevrolet Astro Submodel: Base; Engine: 4.3L V6; EngineCode: LU2; EngineVIN: B; with High Output; Without Service Port;.
