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King Engine Bearings

King Engine Bearings

King SI-Series Main Bearings MB5212SI 020 Bearings, SI-Series, Silicon Aluminum, 0.020 in. Crankshaft Undersize, Chevy, GMC, Big Block, Set of 5

SKU: KINGMB5212SI_020

Main Bearings
King SI-Series Main Bearings MB5212SI 020 Bearings, SI-Series, Silicon Aluminum, 0.020 in. Crankshaft Undersize, Chevy, GMC, Big Block, Set of 5
King Engine Bearings

King Engine Bearings

King SI-Series Main Bearings MB5212SI 020 Bearings, SI-Series, Silicon Aluminum, 0.020 in. Crankshaft Undersize, Chevy, GMC, Big Block, Set of 5

SKU: KINGMB5212SI_020

Main Bearings
A$284.69
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.
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Description

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.

Part Type

Main Bearings

Data: v4.2 - Upd: 2026-10-14 10:42:15

Specifications

Product Attributes - Brand
King Engine Bearings
Product Attributes - Manufacturer's Part Number
MB5212SI 020
Product Attributes - Part Type
Main Bearings
Product Attributes - Product Line
King SI-Series Main Bearings
Product Attributes - UPC
611500550454
Product Attributes - Bearing Usage
Direct replacement
Product Attributes - Engine Crankshaft Undersize (in.)
0.020 in.
Product Attributes - Engine Crankshaft Undersize (mm)
0.50mm
Product Attributes - Grooved Bearing
Yes
Product Attributes - Groove Location
Upper
Product Attributes - Groove Style
1/2
Product Attributes - Thrust Bearing Oversize
Stock
Product Attributes - Bearing Material
Bi-metal, silicon aluminum
Product Attributes - Quantity
Sold as a set of 5.

Reference Information

Brand Name/s King Engine Bearings
StreetFX SKU kingMB5212SI_020
SFX Item ID 4858948
Supplier Item Code 4858948
Manufacturer SKU MB5212SI 020
Manufacturer UPC 611500550454
Alternative References KGB-MB5212SI020, MB5212SI

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1965
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size6.5L/396
  • MakeCHEVROLET
    Beginning Year1966
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size7.0L/427
  • MakeCHEVROLET
    Beginning Year1970
    Ending Year1972
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size6.6L/402
  • MakeCHEVROLET
    Beginning Year1970
    Ending Year1990
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
  • MakeCHEVROLET
    Beginning Year1991
    Ending Year1995
    Engine TypeV8
    Engine FamilyChevy big block Gen V
    Engine Size7.4L/454
  • MakeCHEVROLET
    Beginning Year1996
    Ending Year1999
    Engine TypeV8
    Engine FamilyChevy big block Gen VI
    Engine Size7.4L/454
  • MakeGMC
    Beginning Year1968
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size6.5L/396
  • MakeGMC
    Beginning Year1970
    Ending Year1972
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size6.6L/402
  • MakeGMC
    Beginning Year1970
    Ending Year1990
    Engine TypeV8
    Engine FamilyChevy big block Mark IV
    Engine Size7.4L/454
  • MakeGMC
    Beginning Year1991
    Ending Year1995
    Engine TypeV8
    Engine FamilyChevy big block Gen V
    Engine Size7.4L/454
  • MakeGMC
    Beginning Year1996
    Ending Year1996
    Engine TypeV8
    Engine FamilyChevy big block Gen VI
    Engine Size7.4L/454
  • MakeGMC
    Beginning Year1996
    Ending Year1999
    Engine TypeV8
    Engine FamilyChevy big block Gen VI
    Engine Size7.4L/454

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