King SI-Series Main Bearings

4.2 out of 5 stars 79 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 43 Items.

Results 1 - 25 of 32

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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

Estimated Ship Date: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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

Estimated Ship Date: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

King SI-Series Main Bearings MB5293SI 020

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

Part Number: KGB-MB5293SI020

Not Yet Reviewed

Estimated Ship Date: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

King SI-Series Main Bearings MB5534SI 010

Main Bearings, SI-Series, Full Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Jeep, Mopar, Set of 5

Part Number: KGB-MB5534SI010

Not Yet Reviewed

Estimated Ship Date: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

King SI-Series Main Bearings MB5766SI

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

Part Number: KGB-MB5766SI

Not Yet Reviewed

Estimated Ship Date: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

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: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

King SI-Series Main Bearings MB5534SI 020

Main Bearings, SI-Series, Full Groove, .020 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Jeep, Mopar, Set of 5

Part Number: KGB-MB5534SI020

Not Yet Reviewed

Estimated Ship Date: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

King SI-Series Main Bearings MB5398SI

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

Part Number: KGB-MB5398SI

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

King SI-Series Main Bearings MB 445SI 010

Main Bearings, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, GM V6, Set of 5

Part Number: KGB-MB445SI010

Not Yet Reviewed

Estimated Ship Date: Monday 9/29/2025

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Estimated Ship Date: Monday 9/29/2025

King SI-Series Main Bearings MB5534SI 030

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

Part Number: KGB-MB5534SI030

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

King SI-Series Main Bearings MB5293SI 040

Main Bearings, SI-Series, Silicon Aluminum, 0.040 in. Crankshaft Undersize, Chevy, Set of 5

Part Number: KGB-MB5293SI040

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

King SI-Series Main Bearings MB 445SI 001

Main Bearings, 1/2 Groove, .001 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, GM V6, Set of 5

Part Number: KGB-MB445SI001

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

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