Sealed Power MA Series Main Bearings

4.29 out of 5 stars 75 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 4400MA

Main Bearings, Standard Size, Bi Metal, 1/2 Groove, Chevy, Big block, Set of 5

Part Number: SLP-4400MA

4.33 out of 5 stars ( 6 )

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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 )

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Sealed Power MA Series Main Bearings 4663MA

Main Bearing Set;

Part Number: SLP-4663MA

4.88 out of 5 stars ( 8 )

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Sealed Power MA Series Main Bearings 5085MA

Main Bearings, Standard Size, Bi Metal, 3/4 Groove, Chevy, V6, 3.3L, 3.8L, 4.3L, Set of 4

Part Number: SLP-5085MA

2.0 out of 5 stars ( 1 )

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Sealed Power MA Series Main Bearings 4663MA10

Main Bearing Set;

Part Number: SLP-4663MA10

5.0 out of 5 stars ( 2 )

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Sealed Power MA Series Main Bearings 4125MA20

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 )

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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

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Sealed Power MA Series Main Bearings 4125MA10

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

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Sealed Power MA Series Main Bearings 5078MA10

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: Today

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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

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Sealed Power MA Series Main Bearings 4663MA20

Main Bearing Set;

Part Number: SLP-4663MA20

5.0 out of 5 stars ( 1 )

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Sealed Power MA Series Main Bearings 5085MA10

Main Bearings, 0.010 in. Crankshaft Undersize, Bi Metal, 3/4 Groove, Chevy, V6, 3.3L, 3.8L, 4.3L, Set of 4

Part Number: SLP-5085MA10

Not Yet Reviewed

Estimated Ship Date: Oct 13, 2025 if ordered today

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Estimated Ship Date: Oct 13, 2025 if ordered today

Sealed Power MA Series Main Bearings 5085MA20

Main Bearings, 0.020 in. Crankshaft Undersize, Bi Metal, 3/4 Groove, Chevy, V6, 3.3L, 3.8L, 4.3L, Set of 4

Part Number: SLP-5085MA20

Not Yet Reviewed

Estimated Ship Date: Oct 13, 2025 if ordered today

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Estimated Ship Date: Oct 13, 2025 if ordered today

Sealed Power MA Series Main Bearings 6622MA

Main Bearings, MA Series, Direct Replacement, Stock Size, Toyota, 2.0L, 2.2L, Set of 5

Part Number: SLP-6622MA

Not Yet Reviewed

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Sealed Power MA Series Main Bearings 7292MA75MM

Main Bearings, MA Series, 0.75mm Crankshaft Undersize, Bi-metal Aluminum Alloy, 1/2 Groove, Ford, Lincoln, Mercury, 4.6L, Set of 5

Part Number: SLP-7292MA75MM

Not Yet Reviewed

Estimated Ship Date: Oct 10, 2025 if ordered today

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Estimated Ship Date: Oct 10, 2025 if ordered today

Sealed Power MA Series Main Bearings 4125MA30

Main Bearing Set;

Part Number: SLP-4125MA30

Not Yet Reviewed

Estimated Ship Date: Oct 10, 2025 if ordered today

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Estimated Ship Date: Oct 10, 2025 if ordered today

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Sealed Power Main Bearing Sets 4125M30

5 out of 5 stars ( 1 )

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Sealed Power MA Series Main Bearings 4125MA40

Main Bearing Set;

Part Number: SLP-4125MA40

Not Yet Reviewed

Estimated Ship Date: Oct 10, 2025 if ordered today

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Estimated Ship Date: Oct 10, 2025 if ordered today

Sealed Power MA Series Main Bearings 5085MA40

Main Bearings, 0.040 in. Crankshaft Undersize, Bi Metal, 3/4 Groove, Chevy, V6, 3.3L, 3.8L, 4.3L, Set of 4

Part Number: SLP-5085MA40

Not Yet Reviewed

Estimated Ship Date: Oct 10, 2025 if ordered today

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Estimated Ship Date: Oct 10, 2025 if ordered today

Sealed Power MA Series Main Bearings 4663MA60

Main Bearing Set;

Part Number: SLP-4663MA60

Not Yet Reviewed

Estimated Ship Date: Oct 13, 2025 if ordered today

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Estimated Ship Date: Oct 13, 2025 if ordered today

Sealed Power MA Series Main Bearings 4663MA40

Main Bearing Set;

Part Number: SLP-4663MA40

Not Yet Reviewed

Estimated Ship Date: Oct 13, 2025 if ordered today

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Estimated Ship Date: Oct 13, 2025 if ordered today

Sealed Power MA Series Main Bearings 5078MA40

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: Oct 10, 2025 if ordered today

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Estimated Ship Date: Oct 10, 2025 if ordered today

Sealed Power MA Series Main Bearings 7296MA50MM

Main Bearings, 0.50mm Crankshaft Undersize, Bi Metal, 1/2 Groove, Ford, Lincoln, Mercury, 4.6L, 5.4L, Set of 5

Part Number: SLP-7296MA50MM

Not Yet Reviewed

Estimated Ship Date: Oct 13, 2025 if ordered today

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Estimated Ship Date: Oct 13, 2025 if ordered today

Sealed Power MA Series Main Bearings 7296MA75MM

Main Bearings, MA Series, 0.75mm Crankshaft Undersize, Bi-metal Aluminum Alloy, 1/2 Groove, Ford, Lincoln, Mercury, Set of 4

Part Number: SLP-7296MA75MM

Not Yet Reviewed

Estimated Ship Date: Oct 13, 2025 if ordered today

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Estimated Ship Date: Oct 13, 2025 if ordered today

Sealed Power MA Series Main Bearings 5085MA30

Main Bearings, 0.030 in. Crankshaft Undersize, Bi Metal, 3/4 Groove, Chevy, V6, 3.3L, 3.8L, 4.3L, Set of 4

Part Number: SLP-5085MA30

Not Yet Reviewed

Estimated Ship Date: Oct 13, 2025 if ordered today

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Estimated Ship Date: Oct 13, 2025 if ordered today

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