Perfect Circle MS590H H-Series Main Bearing Set Small Block Ford

The Perfect Circle MS590H is a high-performance H-Series TriMetal main bearing set designed for Small Block Ford engines. Now manufactured under the MAHLE umbrella, these bearings carry on the Perfect Circle tradition of quality that has been trusted since 1895.

Key Features:

• H-Series TriMetal construction with hardened steel back and cast copper-lead substrate
• Medium eccentricity and high crush design for optimal performance
• Thin copper-tin-lead overlay for superior load capacity and seizure resistance
• Enlarged chamfers provide greater crankshaft fillet clearance
• Made without flash plating for better seating and conformability
• 1/2 groove design for proper oil distribution
• Standard size bearings with 0.095-inch maximum wall thickness
• Bearing bore range: 2.4412 to 2.4420 inches

H-Series bearings are ideal for medium-to-high RPM applications and are suitable for both high-performance street engines and competition builds. Originally developed for NASCAR racing, these bearings have proven their durability in demanding conditions. The set includes five main bearings (MB2121H and MB2122H components) to completely service the crankshaft main journals on Small Block Ford applications.

Perfect for engine builders who need reliable performance bearings with proven track record and superior fatigue strength compared to sintered powder metal alternatives.