King SI-Series Main Bearings

4.02 out of 5 stars 88 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 9 Items.

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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

Estimated Ship Date: Today

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Estimated Ship Date: Today

King SI-Series Main Bearings MB5745SI

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

Part Number: KGB-MB5745SI

Not Yet Reviewed

Estimated Ship Date: Jun 9, 2026 if ordered today

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Estimated Ship Date: Jun 9, 2026 if ordered today

King SI-Series Main Bearings MB5739SI

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

Part Number: KGB-MB5739SI

Not Yet Reviewed

Estimated Ship Date: Jun 8, 2026 if ordered today

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Estimated Ship Date: Jun 8, 2026 if ordered today

King SI-Series Main Bearings MB5739SI0.5

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

Part Number: KGB-MB5739SI05

Not Yet Reviewed

Estimated Ship Date: Jun 8, 2026 if ordered today

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Estimated Ship Date: Jun 8, 2026 if ordered today

King SI-Series Main Bearings MB5382SI0.25

Main Bearings, SI-Series, Direct Replacement, 1/2 Groove, Upper, 0.25mm Crankshaft Undersize, Bi-metal, Silicon Aluminum, Subaru, Set of 5

Part Number: KGB-MB5382SI025

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

King SI-Series Main Bearings MB5739SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, Subaru, Sold as a Set of 5

Part Number: KGB-MB5739SI025

Not Yet Reviewed

Estimated Ship Date: Jun 8, 2026 if ordered today

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Estimated Ship Date: Jun 8, 2026 if ordered today

King SI-Series Main Bearings MB5739SI0.75

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

Part Number: KGB-MB5739SI075

Not Yet Reviewed

Estimated Ship Date: Jun 8, 2026 if ordered today

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Estimated Ship Date: Jun 8, 2026 if ordered today

King SI-Series Main Bearings MB5382SI0.5

Main Bearings, SI-Series, Direct Replacement, 1/2 Groove, Upper, 0.50mm Crankshaft Undersize, Bi-metal, Silicon Aluminum, Subaru, Set of 5

Part Number: KGB-MB5382SI05

Not Yet Reviewed

Estimated Ship Date: Jun 8, 2026 if ordered today

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Estimated Ship Date: Jun 8, 2026 if ordered today

King SI-Series Main Bearings MB5745SI0.25

Main Bearings, King SI-Series Main Bearings, .010 in., .25 mm Crankshaft Undersize, Bi-Metal, Subaru, Sold as a Set of 5

Part Number: KGB-MB5745SI025

Not Yet Reviewed

Estimated Ship Date: Jun 9, 2026 if ordered today

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Estimated Ship Date: Jun 9, 2026 if ordered today

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