Sealed Power MA Series Main Bearings

4.3 out of 5 stars 76 Customer Reviews

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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Sealed Power MA Series Main Bearings 7298MA

Sealed Power MA Series Main Bearings 7298MA

Main Bearings, MA-Series, Bi Metal, Standard Size, Chevy, 4.8, 5.3, 5,7, 6.0L, Set of 5

Part Number: SLP-7298MA

4.5 out of 5 stars ( 12 )

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Sealed Power MA Series Main Bearings 4400MA 30

Main Bearings, 0.030 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Chevy, Big block, Set of 5

Part Number: SLP-4400MA30

5.0 out of 5 stars ( 1 )

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Sealed Power MA Series Main Bearings 4124MA

Main Bearing Set;

Part Number: SLP-4124MA

3.0 out of 5 stars ( 1 )

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Sealed Power MA Series Main Bearings 4400MA 10

Main Bearings, 0.010 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Chevy, Big block, Set of 5

Part Number: SLP-4400MA10

Not Yet Reviewed

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Sealed Power MA Series Main Bearings 4926MA 10

Main Bearings, 0.010 in. Crankshaft Undersize, Bi Metal, 3/4 Groove, Chevy, 400, Set of 5

Part Number: SLP-4926MA10

5.0 out of 5 stars ( 2 )

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Sealed Power MA Series Main Bearings 4400MA 20

Main Bearings, 0.020 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Chevy, Big block, Set of 5

Part Number: SLP-4400MA20

5.0 out of 5 stars ( 2 )

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Sealed Power MA Series Main Bearings 4400MA 40

Main Bearings, 0.040 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Chevy, Big block, Set of 5

Part Number: SLP-4400MA40

Not Yet Reviewed

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Sealed Power MA Series Main Bearings 4926MA

Main Bearings, Standard Size, Bi Metal, 3/4 Groove, Chevy, 400, Set of 5

Part Number: SLP-4926MA

5.0 out of 5 stars ( 1 )

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Sealed Power MA Series Main Bearings 6689MA 10

Main Bearings, MA Series, Direct Replacement, 0.010 in. Crankshaft Undersize, AMC, Buick, Chevrolet, GMC, Jeep, Oldsmobile, Pontiac, 2.5L, Set of 5

Part Number: SLP-6689MA10

Not Yet Reviewed

Estimated Ship Date: Jan 5, 2026 if ordered today

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Estimated Ship Date: Jan 5, 2026 if ordered today

Sealed Power MA Series Main Bearings 7144MA 40

Main Bearings, 0.040 in. Crankshaft Undersize, Bi Metal, 3/4 Groove, Buick, V6, 3.0L, 3.8L, Set of 4

Part Number: SLP-7144MA40

Not Yet Reviewed

Estimated Ship Date: Jan 5, 2026 if ordered today

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Estimated Ship Date: Jan 5, 2026 if ordered today

Sealed Power MA Series Main Bearings 4124MA 40

Main Bearing Set;

Part Number: SLP-4124MA40

Not Yet Reviewed

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