Complete engines are fully assembled powerplants designed as direct replacements for failed or damaged original equipment. These units integrate all core components – cylinder block, crankshaft, cylinder head(s), and associated systems – providing a ready-to-install solution. Applications span the full vehicle range, from light-duty passenger cars to heavy-duty trucks and industrial equipment. Key technical features include pre-installed sensors, wiring harnesses, and often, initial fluid fills, simplifying installation and minimizing downtime. Engines are specified by engine code, displacement, and horsepower rating to ensure compatibility. Assemblies undergo rigorous testing to meet or exceed OEM performance specifications.