Perfect Circle MS1432HX H-Series Main Bearing Set Ford - 351M 351W 400

The Perfect Circle MS1432HX is a high-performance H-Series crankshaft main bearing set designed for Ford 351M, 351W, and 400 V8 engines from 1977-1998. This set includes 5 precision-engineered tri-metal bearings featuring a 1/2 groove design and measures 0.001 inch thinner than standard size for increased clearance in performance applications.

H-Series Performance Features:

• Medium level of eccentricity with high crush factor for superior bearing retention
• Hardened steel backing with carefully selected thin overlay for enhanced durability
• Tri-metal construction optimized for high-performance and racing applications
• Enlarged chamfers at bearing sides provide greater crankshaft fillet clearance
• Manufactured without flash plating for improved bearing seating and break-in
• 0.001 inch undersized thickness provides additional oil clearance for modified engines

Originally developed for NASCAR competition, these H-Series main bearings are ideal for engines operating at medium-to-high RPM ranges and work exceptionally well with crankshafts featuring oversize fillets. The proven design combines race-proven performance with the reliability needed for street performance and engine rebuilds. Perfect Circle/Clevite bearings have powered every NASCAR championship since 1948, delivering unmatched quality and durability in demanding applications.