Click to zoom in
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
Bearings
Engine and drivetrain bearings for domestic, import, and diesel platforms are stocked at Black Ops Auto Works. Shop main bearings, rod bearings, cam bearings, thrust bearings, wheel bearings, pilot bearings, transmission bearing kits, and differential bearing sets for HEMI 5.7, 6.1, 6.4, and 6.2 supercharged engines, LS and LT platforms, Coyote V8s, Duramax, Cummins, and Power Stroke diesels, and popular import engines like the VQ35, VQ37, VR38DETT, K20, K24, and 2JZ. Every bearing is filterable by year, make, model, engine code, and bearing clearance so the correct part ships the first time. Black Ops Auto Works carries 1250 bearing SKUs across engine internals, transmission and transfer case hardware, differential components, and wheel end assemblies. What This Category Covers Bearings are the precision-fit wear surfaces that keep an engine, transmission, and axle assembly spinning true under load. A correctly sized bearing set with the right clearance is one of the most impor...
View Bearings Products
Engine
Engine parts and engine bay upgrades for Dodge, Jeep, RAM, Chrysler, Chevrolet, Ford, Toyota, Nissan, Subaru, and Honda vehicles are stocked at Black Ops Auto Works. Shop oil catch cans, supercharger pulleys, thermostats, radiators, cooling parts, throttle bodies, intake manifolds, headers, ignition coils, spark plugs, sensors, gaskets, fuel pumps, valve covers, engine covers, billet cap covers, and full engine bay dress-up parts for HEMI, Hellcat, Trackhawk, Redeye, Demon, Scat Pack, RAM TRX, LS, LT, Coyote, EcoBoost, K-Series, and 2JZ builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 14,298 engine SKUs across performance, cooling, oil control, ignition, and appearance categories. What This Category Covers The Engine collection combines OEM-replacement engine service parts with performance aftermarket upgrades for supercharged, turbocharged, and naturally aspirated builds...
View Engine Products
Engine Block
Engine block parts and internals for HEMI, Hellcat, Trackhawk, TRX, LS, LT, Coyote, EcoBoost, K-Series, VR38DETT, and Cummins diesel builds are stocked at Black Ops Auto Works. Shop main and rod bearings, engine gaskets and gasket kits, engine mounts, block off plates, block heaters, PCV valves, sleeves, engine covers, and complete engines. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 2,187 engine block SKUs across rotating assembly, sealing, mounting, and engine bay dress-up categories. What This Category Covers The Engine Block collection groups the internal and structural components that make up the bottom end and block assembly of a performance or OEM-replacement engine. Coverage spans bearings for rotating assembly refreshes, gaskets and gasket kits for sealing rebuilds, engine mounts for swap and performance builds, and engine bay dress-up pieces for HEMI, Hellcat, and ...
View Engine Block Products
King Engine Bearings
King Engine Bearings main and connecting rod bearings for GM LS and Vortec V8, Ford Windsor and Duratec, BMW N47, Nissan VR38DETT and SR20DE, Toyota 3UR-FE, and Hyundai/Kia and VW/Audi engines are stocked at Black Ops Auto Works. Shop main bearing sets, connecting rod bearing sets, and undersize and performance coated bearings across gasoline and diesel engine platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 591 King Engine Bearings SKUs across main bearing, rod bearing, and size specific categories. What This Category Covers The King Engine Bearings category groups together every main and connecting rod bearing set produced by King for gasoline, diesel, marine, and performance engine applications. Coverage spans standard size bearing sets for stock rebuilds, undersize sets for reground crankshafts, and performance coated bearing sets like pMaxKote for high output and ...
View King Engine Bearings Products