Sealed Power MA Series Main Bearing

Fits: Big Block

Main Bearings, Standard Size, Bi Metal, 1/2 Groove, Chrysler, Dodge, Plymouth, Set of 5

Bearing Usage: Performance

Grooved Bearing: Yes

Groove Location: Upper and lower

Groove Style: 1/2

Bearing Material: Bi-metal aluminum alloy, A-Series

Quantity: Sold as a set of 5.

Notes: Maximum outside diameter of thrust flange surface is 3.624 in. 1959-1960 383 cid. engines must verify flange OD before ordering.

These Sealed Power MA Series main bearings can actually polish the journals on your crankshaft. That's because there's a small percentage of silicon mixed in with the aluminum and tin that make up the bearing-surface alloy. The silicon is there for wear resistance, but its toughness actually smoothes the journals of a crank whose surface hasn't been optimized! This special surface alloy is laid over a high-strength 1010 steel backing and delivers improved seizure and corrosion resistance, as well as better control of wall variance. It also helps to minimize debris embedding, which can score the crank's surface.