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.

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Results 1 - 25 of 54

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 )

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King SI-Series Main Bearings MB5650SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford, 429, 460, Set 5

Part Number: KGB-MB5650SI

Not Yet Reviewed

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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 )

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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 )

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King SI-Series Main Bearings MB5650SI 010

Main Bearing, HP-Series, Silicon Aluminum, 0.010 in. Crankshaft Undersize, Ford, 429, 460, Set of 5

Part Number: KGB-MB5650SI010

Not Yet Reviewed

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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 )

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King SI-Series Main Bearings MB5281SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Silicon, Aluminum R Block, Ford, 4.6L, Set of 5

Part Number: KGB-MB5281SI

1.0 out of 5 stars ( 1 )

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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 )

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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: Today

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King SI-Series Main Bearings MB5505SI 020

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

Part Number: KGB-MB5505SI020

Not Yet Reviewed

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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

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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

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King SI-Series Main Bearings for 2006-2011 TOWN CAR, GRAND MARQUIS, 1996-2011 CROWN VICTORIA - MB5353SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford, 4.6L, Set of 5

Part Number: KGB-MB5353SI

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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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

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King SI-Series Main Bearings MB5650SI 030

Main Bearing, SI-Series, Silicon Aluminum, 0.030 in. Crankshaft Undersize, Ford, 429, 460, Set of 5

Part Number: KGB-MB5650SI030

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings MB5504SI 030

Main Bearings, SI-Series, Full Groove, .030 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Ford, Set of 5

Part Number: KGB-MB5504SI030

Not Yet Reviewed

Estimated Ship Date: May 4, 2026 if ordered today

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Estimated Ship Date: May 4, 2026 if ordered today

King SI-Series Main Bearings MB5280SI0.25

Main Bearings, HP-Series, Silicon Aluminum, 0.25mm. Crankshaft Undersize, Ford, 4.6, 5.4L, Set of 5

Part Number: KGB-MB5280SI025

Not Yet Reviewed

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King SI-Series Main Bearings MB5442SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, Ford, Mazda, Sold as a Set of 5

Part Number: KGB-MB5442SI

Not Yet Reviewed

Estimated Ship Date: May 1, 2026 if ordered today

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Estimated Ship Date: May 1, 2026 if ordered today

King SI-Series Main Bearings MB 459SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford, Mazda, 3.0L, Set of 4

Part Number: KGB-MB459SI

Not Yet Reviewed

Estimated Ship Date: May 1, 2026 if ordered today

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Estimated Ship Date: May 1, 2026 if ordered today

King SI-Series Main Bearings MB 431SI

Main Bearings, Full Groove, Standard Size, Bi-metal, Silicon Aluminum, Set of 4

Part Number: KGB-MB431SI

Not Yet Reviewed

Estimated Ship Date: May 1, 2026 if ordered today

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Estimated Ship Date: May 1, 2026 if ordered today

King SI-Series Main Bearings MB5280SI0.5

Main Bearings, HP-Series, Silicon Aluminum, 0.50mm. Crankshaft Undersize, Ford, 4.6, 5.4L, Set of 5

Part Number: KGB-MB5280SI05

2.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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King SI-Series Main Bearings MB4034SI0.5

Main Bearings, SI-Series, Silicon Aluminum, 0.50mm. Crankshaft Undersize, Ford, 3.8, 3.9, 4.2L, Set of 4

Part Number: KGB-MB4034SI05

Not Yet Reviewed

Estimated Ship Date: May 4, 2026 if ordered today

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Estimated Ship Date: May 4, 2026 if ordered today

King SI-Series Main Bearings MB 459SI0.25

Main Bearings, AM-Series, Alecular Silicon, 0.25mm Crankshaft Undersize, Mitsubishi, 3.0L, Set of 4

Part Number: KGB-MB459SI025

Not Yet Reviewed

Estimated Ship Date: May 4, 2026 if ordered today

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Estimated Ship Date: May 4, 2026 if ordered today

King SI-Series Main Bearings MB5504SI 040

Main Bearings, SI-Series, Full Groove, .040 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Ford, Set of 5

Part Number: KGB-MB5504SI040

Not Yet Reviewed

Estimated Ship Date: May 4, 2026 if ordered today

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Estimated Ship Date: May 4, 2026 if ordered today

King SI-Series Main Bearings MB4034SI0.25

Main Bearings, SI-Series, Silicon Aluminum, 0.25mm. Crankshaft Undersize, Ford, 3.8, 3.9, 4.2L, Set of 4

Part Number: KGB-MB4034SI025

Not Yet Reviewed

Estimated Ship Date: May 4, 2026 if ordered today

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Estimated Ship Date: May 4, 2026 if ordered today

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