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.

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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: Today

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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 )

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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 )

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King SI-Series Main Bearings for 2011-2017 F-150, MUSTANG - MB5734SI

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi Metal, Ford, Coyote, Set of 5

Part Number: KGB-MB5734SI

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 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

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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

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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: Today

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King SI-Series Main Bearings MB5382SI

Main Bearings, SI-Series, Direct Replacement, 1/2 Groove, Upper, Stock, Bi-metal, Silicon Aluminum, Subaru, Set of 5

Part Number: KGB-MB5382SI

Not Yet Reviewed

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King SI-Series Main Bearings MB5707SI

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

Part Number: KGB-MB5707SI

Not Yet Reviewed

Estimated Ship Date: Today

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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: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4272SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, General Motors, Sold as a Set of 4

Part Number: KGB-MB4272SI025

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings for 2011-2017 F-150, MUSTANG - MB5734SI0.5

Main Bearings, SI-Series, 1/2 Groove, 0.50mm Crankshaft Undersize, Bi Metal, Ford, Coyote, Set of 5

Part Number: KGB-MB5734SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4272SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, General Motors, Sold as a Set of 4

Part Number: KGB-MB4272SI05

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings MB4272SI.026

Main Bearings, King SI-Series Main Bearings, .001 in., .026 mm Crankshaft Undersize, Bi-Metal, General Motors, Sold as a Set of 4

Part Number: KGB-MB4272SI026

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB 621SI0.25

Main Bearings, SI-Series, Bi-metal, 0.25mm Crankshaft Undersize, Ford, 6.8L, Set of 5

Part Number: KGB-MB621SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings for 2011-2017 F-150, MUSTANG - MB5734SI0.25

Main Bearings, SI-Series, 1/2 Groove, 0.25mm Crankshaft Undersize, Bi Metal, Ford, Coyote, Set of 5

Part Number: KGB-MB5734SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 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

Estimated Ship Date: Today

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King SI-Series Main Bearings MB5661SI

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

Part Number: KGB-MB5661SI

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings MB5280SI0.75

Main Bearings, SI-Series, Silicon Aluminum, 0.75mm. Crankshaft Undersize, Ford, 4.6, 5.4L, Set of 5

Part Number: KGB-MB5280SI075

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5661SI0.5

Main Bearings, King SI-Series Main Bearings, .020 in., .50 mm Crankshaft Undersize, Bi-Metal, Audi, Volkswagen, Sold as a Set of 5

Part Number: KGB-MB5661SI05

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 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: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB5442SI0.75

Main Bearings, King SI-Series Main Bearings, .030 in., .75 mm Crankshaft Undersize, Bi-Metal, Ford, Mazda, Sold as a Set of 5

Part Number: KGB-MB5442SI075

Not Yet Reviewed

Estimated Ship Date: Today

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King SI-Series Main Bearings MB4508SI

Main Bearings, King SI-Series Main Bearings, Stock Size, Bi-Metal, for use on Acura®, for use on Honda®, Saturn, Sold as a Set of 4

Part Number: KGB-MB4508SI

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

King SI-Series Main Bearings MB4525SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, Lexus, Lotus, Toyota, Sold as a Set of 4

Part Number: KGB-MB4525SI025

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

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