Perfect Circle MS804P Main Bearing Set for Oldsmobile V8 350/400/425/455

The Perfect Circle MS804P is a premium main bearing set manufactured by Clevite MAHLE, engineered specifically for Oldsmobile V8 engines including the 350 (including Diesel), 400, 425, and 455 cubic inch displacements from 1965-1985. This complete bearing kit provides reliable crankshaft support for engine rebuilds and performance applications.

P-Series Construction:

• Tri-metal cast copper lead design with steel backing for maximum structural support
• Cast copper lead intermediate layer engineered to withstand high loads and engine operation demands
• Electroplated lead-tin-copper (babbitt) overlay on running surface for superior wear characteristics
• Reduced overlay thickness to prevent overlay fatigue and hen tracking
• High crush factor design ensures maximum bearing retention in the housing
• Higher eccentricity to compensate for high-load factors and crankshaft distortion

Kit Contents:

• Full grooved upper bearings for enhanced oil distribution
• One half-grooved lower bearing for optimal load distribution
• Complete set for all main journal positions

The P-Series represents the oldest and most proven line in the Clevite 77 bearing family, specifically designed for high-revving engines and demanding applications. These bearings deliver exceptional conformability, embedability, and fatigue resistance that exceeds original equipment specifications. Standard size bearings ensure proper crankshaft clearances when journals are within factory specifications.