Perfect Circle MS2328H H-Series Main Bearing Set Standard Size

The Perfect Circle MS2328H is a high-performance H-Series main bearing set designed for serious engine builders and performance applications. Now part of the Clevite/MAHLE family, Perfect Circle continues to deliver professional-grade engine components trusted by racers and mechanics worldwide.

H-Series Performance Features:

• Medium level of eccentricity with high crush design for superior bearing retention and seating
• Enlarged chamfers provide greater crankshaft fillet clearance for performance crankshafts
• No flash plating construction ensures optimal bearing-to-journal seating during break-in
• Developed for NASCAR racing but suitable for all types of high-performance competition engines
• Ideal for engines running in medium to high RPM ranges

Application Note: This standard size main bearing set is commonly used in Cummins 5.9L and 6.7L diesel engine builds. H-Series bearings are recommended for crankshafts with oversized fillets and performance applications where precise clearances and reliable oil film strength are critical.

When selecting performance bearings, H-Series offers the best balance of features for most engine builds, making the MS2328H an excellent choice for rebuilds ranging from heavy-duty street performance to competition applications.