LS main bearings 020 undersize
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King Engine Bearings GM Vortex / Gen III IV LS-Series Main Bearing Set

KINGMB5877SI020
611500626814
Bearings
1 Units In Stock - Ships Next Business Day
$ 142.50
$ 142.50

SKU: MB5877SI020   |   UPC: 611500626814


King Engine Bearings Main Bearing Set – GM LS-Series / Vortec (Gen III & IV) 0.020" Undersize

The King Engine Bearings Main Bearing Set is a high-performance replacement designed specifically for GM LS-Series (Gen III & IV) and Vortec engines. This complete set of five main bearings is manufactured to 0.020" undersize specifications and features King’s advanced SI tri-metal material, offering superior load capacity, excellent fatigue resistance, and outstanding embeddability.

Ideal for both street performance builds and high-output applications, these bearings deliver reliable oil film retention and smooth operation under demanding conditions. Whether you're rebuilding an LS1, LS3, LS7, LSA, or popular Vortec 4.8L/5.3L/6.0L/6.2L engine, the MB5877SI020 provides the durability and precision that professional engine builders trust.

Key Features

  • SI Tri-Metal Construction – Advanced high-performance alloy with superior strength and fatigue resistance
  • 0.020" Undersize – Designed for crankshafts ground 0.020" undersize during engine rebuilds
  • Excellent Embeddability – Superior ability to absorb contaminants without damaging the crankshaft
  • Optimized Oil Groove Design – Provides excellent oil film retention under high loads
  • Precision Machined – Tight tolerances for perfect fitment and consistent performance
  • High Load Capacity – Ideal for performance, forced-induction, and high-mileage LS engines
Spec Detail
Part Number MB5877SI020
Brand King Engine Bearings
Type Main Bearing Set (5 Bearings)
Engine Application GM LS-Series (Gen III & IV) & Vortec
Undersize 0.020"
Material SI Tri-Metal (High-Performance Alloy)
Country of Origin Israel
Warranty King Engine Bearings Limited Warranty

Whats Included

  • Complete Main Bearing Set (5 main bearings)
  • Installation instructions

Product Notes

  • Designed for 0.020" undersize crankshafts in GM LS and Vortec engines
  • Excellent choice for performance, boosted, and high-mileage LS builds
  • Professional installation and proper crankshaft inspection recommended

Installation Notes

  • Requires precise crankshaft measurement and bearing clearance verification
  • Estimated time: 2–4 hours (during engine rebuild)
  • Professional engine builder installation strongly recommended

This Part Fits

Year Range Make Engine Family Common Applications
1997–2017+ GM LS-Series (Gen III & IV) & Vortec LS1, LS2, LS3, LS6, LS7, L76, L92, L99, LSA, 4.8L, 5.3L, 6.0L, 6.2L

Why Choose King Engine Bearings?

  • Global leader in high-performance and OE-replacement engine bearings since 1960
  • Advanced SI tri-metal technology for superior durability under load
  • Precision manufacturing with tight tolerances trusted by professional engine builders
  • Proven performance in street, performance, and racing applications worldwide

Frequently Asked Questions

  • Q: What does the “020” in MB5877SI020 mean?
    A: It indicates these bearings are 0.020" undersize, designed for crankshafts that have been ground 0.020" undersize during a rebuild.
  • Q: Will these fit my LS3 or LS7 engine?
    A: Yes, the MB5877SI020 fits all GM LS-Series Gen III and Gen IV engines, including LS3, LS7, LSA, and Vortec variants.
  • Q: Are these bearings suitable for boosted or high-horsepower builds?
    A: Yes, King’s SI material offers excellent load capacity and is popular for forced-induction LS engines.
  • Q: Do I need to check bearing clearance?
    A: Yes, always verify proper bearing clearance during installation for optimal performance and engine longevity.

Shipping & Handling

  • Method: Ground UPS or FedEx
  • Availability: In stock – ships same or next business day
  • Packaging: Secure King Engine Bearings retail packaging

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