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King Engine Bearings

King SI-Series Main Bearings

4.05 out of 5 stars 87 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 41 Items.

Results 1 - 24 of 24

King SI-Series Main Bearings MB 557SI

King SI-Series Main Bearings MB 557SI

King SI-Series Main Bearings MB 557SI

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

Part Number: KGB-MB557SI

4.0 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

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: Tomorrow

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Estimated Ship Date: Tomorrow

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: Tomorrow

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Estimated Ship Date: Tomorrow

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: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 557SI 001

King SI-Series Main Bearings MB 557SI 001

King SI-Series Main Bearings MB 557SI 001

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

Part Number: KGB-MB557SI001

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

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: Tomorrow

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Estimated Ship Date: Tomorrow

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: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB5116SI 020

King SI-Series Main Bearings MB5116SI 020

King SI-Series Main Bearings MB5116SI 020

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

Part Number: KGB-MB5116SI020

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 529SI 020

King SI-Series Main Bearings MB 529SI 020

King SI-Series Main Bearings MB 529SI 020

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

Part Number: KGB-MB529SI020

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB5116SI STDX

King SI-Series Main Bearings MB5116SI STDX

King SI-Series Main Bearings MB5116SI STDX

Main Bearings, SI-Series, 1/2 Groove, Bi-metal, Silicon Aluminum, Chyrsler, Big Block, Set of 5

Part Number: KGB-MB5116SISTDX

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 557SI 040

King SI-Series Main Bearings MB 557SI 040

King SI-Series Main Bearings MB 557SI 040

Main Bearings, 1/2 Groove, .040 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Small Block, Set of 5

Part Number: KGB-MB557SI040

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 557SISTDX

King SI-Series Main Bearings MB 557SISTDX

King SI-Series Main Bearings MB 557SISTDX

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

Part Number: KGB-MB557SISTDX

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB5116SI

King SI-Series Main Bearings MB5116SI

King SI-Series Main Bearings MB5116SI

Main Bearings, SI-Series, 1/2 Groove, Bi-metal, Silicon Aluminum, Chyrsler, Big Block, Set of 5

Part Number: KGB-MB5116SI

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 529SI 030

King SI-Series Main Bearings MB 529SI 030

King SI-Series Main Bearings MB 529SI 030

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

Part Number: KGB-MB529SI030

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB5116SI 030

King SI-Series Main Bearings MB5116SI 030

King SI-Series Main Bearings MB5116SI 030

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

Part Number: KGB-MB5116SI030

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 558SI 010

King SI-Series Main Bearings MB 558SI 010

King SI-Series Main Bearings MB 558SI 010

Main Bearings, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Dodge, Plymouth, V8, Set of 5

Part Number: KGB-MB558SI010

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 763SI

King SI-Series Main Bearings MB 763SI

King SI-Series Main Bearings MB 763SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, AMC, Jeep, Set

Part Number: KGB-MB763SI

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 529SI 040

King SI-Series Main Bearings MB 529SI 040

King SI-Series Main Bearings MB 529SI 040

Main Bearings, 1/2 Groove, .040 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Ford, Small Block, Set of 5

Part Number: KGB-MB529SI040

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 763SI 010

King SI-Series Main Bearings MB 763SI 010

King SI-Series Main Bearings MB 763SI 010

Main Bearing Set

Part Number: KGB-MB763SI010

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

King SI-Series Main Bearings MB 752SI 010

King SI-Series Main Bearings MB 752SI 010

King SI-Series Main Bearings MB 752SI 010

Main Bearing Set

Part Number: KGB-MB752SI010

Not Yet Reviewed

Estimated Ship Date: May 21, 2026 if ordered today

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Estimated Ship Date: May 21, 2026 if ordered today

King SI-Series Main Bearings MB 752SI

King SI-Series Main Bearings MB 752SI

King SI-Series Main Bearings MB 752SI

Main Bearing Set

Part Number: KGB-MB752SI

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 20, 2026 if ordered today

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Estimated Ship Date: May 20, 2026 if ordered today

King SI-Series Main Bearings MB5532SI 050

King SI-Series Main Bearings MB5532SI 050

King SI-Series Main Bearings MB5532SI 050

Main Bearings, King SI-Series Main Bearings, .050 in., 1.27 mm Crankshaft Undersize, Bi-Metal, Chevy, Sold as a Set of 5

Part Number: KGB-MB5532SI050

Not Yet Reviewed

Estimated Ship Date: May 21, 2026 if ordered today

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Estimated Ship Date: May 21, 2026 if ordered today

King SI-Series Main Bearings MB 763SI 020

King SI-Series Main Bearings MB 763SI 020

King SI-Series Main Bearings MB 763SI 020

Main Bearing Set

Part Number: KGB-MB763SI020

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

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Estimated Ship Date: May 19, 2026 if ordered today

King SI-Series Main Bearings MB5532SI 060

King SI-Series Main Bearings MB5532SI 060

King SI-Series Main Bearings MB5532SI 060

Main Bearings, King SI-Series Main Bearings, .060 in., 1.52 mm Crankshaft Undersize, Bi-Metal, Chevy, Sold as a Set of 5

Part Number: KGB-MB5532SI060

Not Yet Reviewed

Estimated Ship Date: May 20, 2026 if ordered today

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Estimated Ship Date: May 20, 2026 if ordered today

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