Clevite MS-1061P-30 P-Series Main Bearing Set Undersize - 030

The Clevite MS-1061P-30 is a high-performance main bearing set designed for demanding racing and performance engine applications. This P-Series bearing set features .030" undersize dimensions for use with reground crankshafts, combining proven TriMetal construction with performance-focused engineering.

P-Series Performance Design:

• High eccentricity design to narrow bearing contact patterns and maximize oil delivery to connecting rod bearings
• Full-groove upper shells provide maximum oil flow to rod journals for high-RPM operation
• High crush design ensures superior bearing retention under extreme loads
• Reduced overlay thickness prevents overlay fatigue and "hen tracking" in severe duty applications
• Hardened steel backing provides exceptional strength and fretting resistance

Optimized Bearing Groove Technology:

This bearing set utilizes Clevite's proven 180-degree groove design in the upper main shells. Through extensive testing, this configuration has been demonstrated to provide the best overall performance by maintaining optimal oil film thickness while still supplying adequate lubrication to connecting rod bearings. The ungrooved lower shells maximize load-carrying capacity and oil film development where bearing loads are highest.

When to Choose P-Series Bearings:

P-Series main bearings are ideal for engines experiencing rod bearing oil starvation, indicated by polishing, smearing, or discoloration concentrated at the bearing center. The higher eccentricity and full-groove design address this condition by increasing oil delivery to the rods. These bearings are particularly well-suited for extremely high-RPM applications where severe rod bore distortion occurs, typically evidenced by nearly full parting-line-to-parting-line shaft contact patterns with standard bearings.

TriMetal Construction Benefits:

Clevite's legendary TriMetal design combines a steel backing, copper-lead intermediate layer, and lead-tin-copper overlay to deliver superior strength, fatigue resistance, and conformability. The reduced overlay thickness in P-Series bearings is specifically engineered to withstand the extreme loads and temperatures encountered in competition engines.

These bearings are manufactured without flash plating for improved seating characteristics and feature enlarged chamfers for enhanced crankshaft fillet clearance. If you're building a high-performance engine with a reground crankshaft and need maximum oil delivery to the connecting rods, the Clevite MS-1061P-30 P-Series main bearing set delivers proven durability under the most demanding conditions.