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Main Bearing Set Small Block Chevy
InfoVehicle Info Needed
KING ENGINE BEARINGSPART NUMBER: 429-MB557SI010

Main Bearing Set Small Block Chevy

$2999
ShippingShips on Sep 02, 2026
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$400
Performance Main Bearing Set Small Block Chevy (Large Journal)

555-25012

Performance Main Bearing Set Small Block Chevy (Large Journal)

$2599

Small Block Chevy SI-Series Main Bearings
    Main Bearing Set
  • Small Block Chevy
  • SI-Series
  • .010" Undersize
    King offers 3 levels of main bearings for use in OE Stock, High Performance, and Extreme Performance applications. King main bearings are sold in engine sets.



    AM-Series & SI-Series Bearings:
    King AM-Series & SI-Series bearings are recommended for OE applications. AM-Series bearings are aluminum-copper-tin plus Alloy on high-strength steel (Bi-Metal). SI-Series bearings are Silicon-Aluminum bearings (Bi-Metal) are designed for Aftermarket Gasoline or Diesel Engine Rebuilding & Performance Engines with OE Crankshafts.

    HP-Series Bearings:
    King HP-Series bearings are recommended for street and strip high performance applications. These Bi-Metal Silicon Aluminum bearings are designed for blown, turbocharged, NOS, and alcohol-fueled engines using aftermarket crankshafts. These bearings have chamfered oil holes are fit aftermarket cranks machined with a large radii at the edge of the journals. Most main bearings in the HP-Series are 3/4 grooved for improved oiling to the rod journals. Ideal for use in High Load, Short Duration Applications like Drag Racing, Tractor Pulling, Monster Trucks, etc.

    XP-Series Bearings:
    King XP-Series bearings are for extreme performance in high-load capacity applications. These Tri-Metal copper lead bearings are designed use on cranks with large radii (narrow rod bearings) and feature enlarged, chamfered oil holes with 1/2 grooving (on most main bearings) for uncompromised lower bearing load capacity. Ideal for use in High Load Circle Track & Endurance Applications.
    What does the King part number Prefix/Suffix mean?



    NOTE: The term "Undersize" refers to a thicker bearing which is used when the Crankshaft has been turned down and is now undersized, not the bearing itself. The term "Oversize" is typically a thinner bearing than stock to allow for increased clearance.
Product LineKing Main Bearings for Domestic Vehicles
BrandKING ENGINE BEARINGS
Package Height1.77
Package Width3.54
Package Length5.12
Weight1.39 PG
Vendor Part NumberMAIN BEARINGS
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
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