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The Moroso windage tray for Chevrolet big-block Mark IV engines is compatible with part numbers 20485 and 20385 new-style configurations. It provides internal oil-control for Mark IV applications, reducing crankshaft windage and supporting consistent oil behavior. This tray fits installations where the new-style 20485/20385 specification is required, making it useful for updated big-block assemblies.
Moroso Chevrolet Big Block Mark IV Windage Tray (For Part No 20485/20385 New Style)
