12000-ZX2-030ZA C*NH8* Block Assembly - Overview. The 12000-ZX2-030ZA C*NH8* Block Assembly is a vital component within Honda marine engine systems. This cylinder block assembly houses the cylinders where combustion occurs, playing a fundamental role in the engine's operation and performance. Designed specifically for Honda Active Marine outboard motors, this component ensures optimal functioning by providing a sturdy engine block foundation that accommodates key internal moving parts. Precision