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Sealed Power MA Series Main Bearings
Main Bearings, MA Series, 0.020 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Ford, Lincoln, Mercury, V8, 221, 260, 289, 302, Set of 5
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Estimated Ship Date: Monday 10/19/2026 Would you rather pick it up?
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Overview
Brand:
Manufacturer's Part Number:
4125MA 20
Part Type:
Product Line:
Summit Racing Part Number:
SLP-4125MA20
UPC:
614046364516
Bearing Usage:
Direct replacement
Engine Crankshaft Undersize (in.):
0.020 in.
Engine Crankshaft Undersize (mm):
0.50mm
Grooved Bearing:
Yes
Groove Location:
Lower
Groove Style:
1/2
Thrust Bearing Oversize:
Stock
Bearing Material:
Bi-metal aluminum alloy, A-Series
Quantity:
Sold as a set of 5.
Sealed Power MA Series Main Bearings
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.
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Some parts are not legal for use in California or other states with similar laws / regulations
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