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 4125MA

Main Bearings, MA Series, Standard Size, Bi Metal, 1/2 Groove, Ford, Lincoln, Mercury, V8, 221, 260, 289, 302, Set of 5

Part Number: SLP-4125MA

4.17 out of 5 stars ( 6 )

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 5078MA 20

Sealed Power MA Series Main Bearings 5078MA 20

Main Bearings, 0.020 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Ford, 351W, 351M, 400, Set of 5

Part Number: SLP-5078MA20

Not Yet Reviewed

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 5078MA

Main Bearings, Standard Size, Bi Metal, 1/2 Groove, Ford, 351W, 351M, 400, Set of 5

Part Number: SLP-5078MA

Not Yet Reviewed

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 5078MA 10

Main Bearings, 0.010 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Ford, 351W, 351M, 400, Set of 5

Part Number: SLP-5078MA10

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 4125MA 10

Main Bearings, MA Series, 0.010 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Ford, Lincoln, Mercury, V8, 221, 260, 289, 302, Set of 5

Part Number: SLP-4125MA10

Not Yet Reviewed

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 4125MA 20

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

Part Number: SLP-4125MA20

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 7296MA

Main Bearings, MA-Series, Bi Metal, Standard Size, Ford, Lincoln, Mercury, 4.6L, Set of 5

Part Number: SLP-7296MA

Not Yet Reviewed

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 7245MA

Main Bearings, Standard Size, Bi Metal, 1/2 Groove, Ford, Mazda, V6, 2.9L, 4.0L, Set of 4

Part Number: SLP-7245MA

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 7289MA

Main Bearings, MA-Series, Bi Metal, Standard Size, Ford, Lincoln, 4.6L, DOHC, Set of 5

Part Number: SLP-7289MA

Not Yet Reviewed

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 7011MA

Main Bearings, Standard Size, Bi Metal, 1/2 Groove, Ford, Mercury, V6, 3.0L, Set of 4

Part Number: SLP-7011MA

Not Yet Reviewed

Estimated Ship Date: Mar 30, 2026 if ordered today

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Estimated Ship Date: Mar 30, 2026 if ordered today

Sealed Power MA Series Main Bearings 7245MA 20

Main Bearings, 0.020 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Ford, Mazda, V6, 2.9L, 4.0L, Set of 4

Part Number: SLP-7245MA20

Not Yet Reviewed

Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

Sealed Power MA Series Main Bearings 7297MA

Main Bearings, MA Series, Direct Replacement, Stock Size, Ford, 6.8L, Set

Part Number: SLP-7297MA

Not Yet Reviewed

Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

Sealed Power MA Series Main Bearings 7292MA

Main Bearings, MA-Series, Bi Metal, Standard Size, Ford, Lincoln, Mercury, 4.6L, Set of 5

Part Number: SLP-7292MA

3.67 out of 5 stars ( 3 )

Estimated Ship Date: Monday 3/16/2026 if shipped by air

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Estimated Ship Date: Monday 3/16/2026 if shipped by air

Sealed Power MA Series Main Bearings 4125MA 40

Main Bearing Set;

Part Number: SLP-4125MA40

Not Yet Reviewed

Estimated Ship Date: Mar 31, 2026 if ordered today

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Estimated Ship Date: Mar 31, 2026 if ordered today

Sealed Power MA Series Main Bearings 6101MA

Main Bearing Set;

Part Number: SLP-6101MA

Not Yet Reviewed

Estimated Ship Date: Mar 31, 2026 if ordered today

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Estimated Ship Date: Mar 31, 2026 if ordered today

Sealed Power MA Series Main Bearings 7456MA20

Main Bearings, MA Series, Direct Replacement, 0.020 in. Crankshaft Undersize, Ford, Lincoln, Mercury, Set of 5

Part Number: SLP-7456MA20

Not Yet Reviewed

Estimated Ship Date: Mar 31, 2026 if ordered today

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Estimated Ship Date: Mar 31, 2026 if ordered today

Sealed Power MA Series Main Bearings 5078MA 40

Main Bearings, 0.040 in. Undersize, Bi Metal, 1/2 Groove, Ford, 351W, 351M, 400, Set of 5

Part Number: SLP-5078MA40

Not Yet Reviewed

Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

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