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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