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King Engine Bearings

King Engine Bearings

King XP-Series Main Bearings MB 509XP 021 Bearings, XP-Series, Copper/Lead/Nickel, 0.021 in. Crankshaft Undersize, Chevy, 400, Set of 5

SKU: KINGMB_509XP_021

Main Bearings
King XP-Series Main Bearings MB 509XP 021 Bearings, XP-Series, Copper/Lead/Nickel, 0.021 in. Crankshaft Undersize, Chevy, 400, Set of 5
King Engine Bearings

King Engine Bearings

King XP-Series Main Bearings MB 509XP 021 Bearings, XP-Series, Copper/Lead/Nickel, 0.021 in. Crankshaft Undersize, Chevy, 400, Set of 5

SKU: KINGMB_509XP_021

Main Bearings
A$320.44
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

Built with enhanced tri-metal, King XP-Series main bearings have a layered copper lead construction, with a nickel plate barrier and lead/tin/copper Babbitt overlay over a steel backing--in an adhesion process that provides superior stability and durability. King's advanced control measures hit a bull's-eye, maintaining wall thickness tolerances far tighter than their competitors: an amazing +/- .0001 in. The XP-Series main bearings are narrowed for large radii crankshafts and feature enlarged, chamfered oil holes with full, 3/4 in., or 1/2 in. grooving for improved oiling. They deliver consistent and reliable performance with a high-load capacity. These race-only Xtreme Performance (XP-Series) Tri-Lecular main bearings are proven track-tough to handle the ground-shaking power of your race engine. Hundreds of sets are available; order the bearings recommended for your vehicle.

Part Type

Main Bearings

Data: v4.2 - Upd: 2026-10-14 10:42:05

Specifications

Product Attributes - Brand
King Engine Bearings
Product Attributes - Manufacturer's Part Number
MB 509XP 021
Product Attributes - Part Type
Main Bearings
Product Attributes - Product Line
King XP-Series Main Bearings
Product Attributes - UPC
611500530722
Product Attributes - Bearing Usage
Performance
Product Attributes - Engine Crankshaft Undersize (in.)
0.021 in.
Product Attributes - Engine Crankshaft Undersize (mm)
0.53mm
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
Tri-metal copper-lead nickel
Product Attributes - Quantity
Sold as a set of 5.

Reference Information

Brand Name/s King Engine Bearings
StreetFX SKU kingMB_509XP_021
SFX Item ID 4859413
Supplier Item Code 4859413
Manufacturer SKU MB 509XP 021
Manufacturer UPC 611500530722
Alternative References KGB-MB509XP021, 509XP

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1970
    Ending Year1980
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size6.6L/400

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