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  • Engine Crankshaft Undersize (mm)
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King Engine Bearings

King SI-Series Main Bearings

4.02 out of 5 stars 85 Customer Reviews

King SI-Series main bearings are recommended for OE applications. These replacement bearings are designed for aftermarket gasoline or diesel engine rebuilding—and performance engines with factory crankshafts. The bearings have an improved crankshaft finish for reducing microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts. King SI-Series main bearings feature improved oil clearance to reduce wear and increase engine life, which in turn reduces operating noise, vibration, and excess oil flow. Order the bearing set designed for fitment on your make and model.

Showing In Stock Items. Show All 338 Items.

Results 1 - 25 of 211

King SI-Series Main Bearings MB5293SI

King SI-Series Main Bearings MB5293SI

King SI-Series Main Bearings MB5293SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Chevy, 4.8, 5.3L, Set of 5

Part Number: KGB-MB5293SI

5.0 out of 5 stars ( 10 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5293SI 010

King SI-Series Main Bearings MB5293SI 010

King SI-Series Main Bearings MB5293SI 010

Main Bearings, SI-Series, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Set of 5

Part Number: KGB-MB5293SI010

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 557SI 010

King SI-Series Main Bearings MB 557SI 010

King SI-Series Main Bearings MB 557SI 010

Main Bearings, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Small Block, Set of 5

Part Number: KGB-MB557SI010

4.67 out of 5 stars ( 6 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 556SI

King SI-Series Main Bearings MB 556SI

King SI-Series Main Bearings MB 556SI

Main Bearings, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminumn, Chevy, Big Block, Set of 5

Part Number: KGB-MB556SI

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 529SI

King SI-Series Main Bearings MB 529SI

King SI-Series Main Bearings MB 529SI

Main Bearings, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford, Small Block, Set of 5

Part Number: KGB-MB529SI

4.25 out of 5 stars ( 4 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5293SI 001

King SI-Series Main Bearings MB5293SI 001

King SI-Series Main Bearings MB5293SI 001

Main Bearings, SI-Series, 0.001 in. Crankshaft Undersize, Bi-metal, Grooved, Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Pontiac, Saab, Set of 5

Part Number: KGB-MB5293SI001

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 509SI

King SI-Series Main Bearings MB 509SI

King SI-Series Main Bearings MB 509SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

Part Number: KGB-MB509SI

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 529SI 010

King SI-Series Main Bearings MB 529SI 010

King SI-Series Main Bearings MB 529SI 010

Main Bearings, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Ford, Small Block, Set of 5

Part Number: KGB-MB529SI010

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5534SI

King SI-Series Main Bearings MB5534SI

King SI-Series Main Bearings MB5534SI

Main Bearings, SI-Series, Full Groove, Standard Size, Bi-metal, Silicon Aluminum, Jeep, Mopar, Set of 5

Part Number: KGB-MB5534SI

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 510SI

King SI-Series Main Bearings MB 510SI

King SI-Series Main Bearings MB 510SI

Main Bearings, SI-Series, Silicon Aluminum, Standard Size, Chrysler, Dodge, Plymouth, 360, Set of 5

Part Number: KGB-MB510SI

3.33 out of 5 stars ( 3 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 556SI 001

King SI-Series Main Bearings MB 556SI 001

King SI-Series Main Bearings MB 556SI 001

Main Bearings, 1/2 Groove, .001 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Big Block, Set of 5

Part Number: KGB-MB556SI001

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 556SI 010

King SI-Series Main Bearings MB 556SI 010

King SI-Series Main Bearings MB 556SI 010

Main Bearings, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Big Block, Set of 5

Part Number: KGB-MB556SI010

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5505SI

King SI-Series Main Bearings MB5505SI

King SI-Series Main Bearings MB5505SI

Main Bearings, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford, Small Block, Modified, Set of 5

Part Number: KGB-MB5505SI

3.4 out of 5 stars ( 5 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5280SI

King SI-Series Main Bearings MB5280SI

King SI-Series Main Bearings MB5280SI

Main Bearings, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford Modular V8, Set of 5

Part Number: KGB-MB5280SI

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5505SI 010

King SI-Series Main Bearings MB5505SI 010

King SI-Series Main Bearings MB5505SI 010

Main Bearings, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Ford, Set of 5

Part Number: KGB-MB5505SI010

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 557SI 020

King SI-Series Main Bearings MB 557SI 020

King SI-Series Main Bearings MB 557SI 020

Main Bearings, 1/2 Groove, .020 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Small Block, Set of 5

Part Number: KGB-MB557SI020

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 509SI 010

King SI-Series Main Bearings MB 509SI 010

King SI-Series Main Bearings MB 509SI 010

Main Bearings, SI-Series, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

Part Number: KGB-MB509SI010

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 556SI 020

King SI-Series Main Bearings MB 556SI 020

King SI-Series Main Bearings MB 556SI 020

Main Bearings, 1/2 Groove, .020 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Big Block, Set of 5

Part Number: KGB-MB556SI020

2.33 out of 5 stars ( 3 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 557SI 030

King SI-Series Main Bearings MB 557SI 030

King SI-Series Main Bearings MB 557SI 030

Main Bearings, 1/2 Groove, .030 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Small Block, Set of 5

Part Number: KGB-MB557SI030

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 556SI 030

King SI-Series Main Bearings MB 556SI 030

King SI-Series Main Bearings MB 556SI 030

Main Bearings, 1/2 Groove, .030 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Big Block, Set of 5

Part Number: KGB-MB556SI030

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 517SI 010

King SI-Series Main Bearings MB 517SI 010

King SI-Series Main Bearings MB 517SI 010

Main Bearings, SI-Series, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Aluminum Silicon, Jeep, Chrysler, Set of 5

Part Number: KGB-MB517SI010

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB 509SI 020

King SI-Series Main Bearings MB 509SI 020

King SI-Series Main Bearings MB 509SI 020

Main Bearings, SI-Series, 1/2 Groove, .020 in. Crankshaft Undersize, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

Part Number: KGB-MB509SI020

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5293SI 030

King SI-Series Main Bearings MB5293SI 030

King SI-Series Main Bearings MB5293SI 030

Main Bearings, SI-Series, 1/2 Groove, .030 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Set of 5

Part Number: KGB-MB5293SI030

Not Yet Reviewed

Estimated Ship Date: Monday 12/15/2025

...Loading

Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB5504SI

King SI-Series Main Bearings MB5504SI

King SI-Series Main Bearings MB5504SI

Main Bearings, SI-Series, Full Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford, Set of 5

Part Number: KGB-MB5504SI

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

King SI-Series Main Bearings MB4272SI

King SI-Series Main Bearings MB4272SI

King SI-Series Main Bearings MB4272SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, General Motors, Sold as a Set of 4

Part Number: KGB-MB4272SI

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 12/15/2025

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Estimated Ship Date: Monday 12/15/2025

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