Clevite MS-979A Engine Crankshaft Main Bearing Set, Flanged

The Clevite MS-979A is an engine crankshaft main bearing set. Main bearings support the crankshaft and rely on a pressurized film of oil to keep the bearing surface separated from the shaft journal. This set includes a flanged bearing with a 3.5670 in flange diameter.

Key Features:

• Engine crankshaft main bearing set from Clevite
• Includes a flanged bearing with a 3.5670 in flange diameter

Main Bearing Grooving Background:

• Bearings ride on an oil film created by shaft rotation, so grooving is kept to what is needed to feed oil to the connecting rods.
• Clevite reports that a simple 180-degree groove in the upper main shell is the best overall design for performance engines.
• Extending the groove into the lower half adds no benefit to the lower shell and reduces upper bearing performance. Longer grooves also increase horsepower loss and peak oil film pressure.

Clevite Performance Bearing Series Overview:

• P-Series: High-performance parts with unique core part numbers, high crush for retention and reduced overlay thickness. Most P-Series main sets are full grooved to maximize oil flow to the rod bearings.
• H-Series: Medium eccentricity, high crush and enlarged chamfers, made without flash plating for better seating. Developed for NASCAR-type racing and suitable for competition engines.
• K-Series (TriArmor): Moly/graphite surface treatment over the TriMetal construction for added protection.
• V-Series: Duplicates the former Vandervell parts, using a lead-indium overlay and a single-piece thrust bearing in main sets.
• M-Series: Micro bearings with a nominal .006 thick babbitt lining on a hardened steel back, intended for engines with severe crankshaft deflection. Frequent inspection is recommended.

Check the part number suffix and the manufacturer's information to confirm which series and clearance suit your build.