Perfect Circle MS1039P Main Bearing Set for Ford Big Block 370/429/460

The Perfect Circle MS1039P is a premium P-Series main bearing set engineered for Ford big block V8 engines, including 370ci (6.1L), 429ci (7.0L), and 460ci (7.5L) applications from 1968-1997. This standard size bearing set is specifically designed for high-revving performance engines that demand exceptional durability under extreme conditions.

Key Features:

• Tri-metal cast copper lead construction for superior strength and wear resistance
• Higher eccentricity and high crush factor to compensate for high-load factors and distortion
• Steel backing with extra-thin overlays to prevent overlay fatigue
• Oil grooves extend around both halves for improved lubrication
• Includes 1-piece thrust washer set with lower half flanged thrust bearing at position #5
• Compatible with cast iron Romeo block applications

P-Series bearings represent the performance-oriented line of the Clevite bearing family, specifically engineered to handle the demanding conditions found in racing and high-performance street applications. The advanced tri-metal construction and optimized geometry provide exceptional protection for your crankshaft while maintaining consistent oil clearances even under high-load conditions.