Big 3 Engines

Engines • Transmissions • Installation

L83 5.3L Replacement Engines & Rebuilds

Explore L83 performance options

Find the right 5.3L engine for your Chevrolet or GMC. Compare actual product listings, review the build and warranty, then request help or place your order.

Start with the original engine

The listings below cover L83 applications including 2014–2018 Silverado/Sierra and 2015–2020 Tahoe/Suburban/Yukon. Confirm your exact vehicle before choosing a truck or SUV listing.

Model years describe the application family, not automatic interchange. VIN/RPO, drivetrain, controls, fuel system, accessories and emissions configuration must match. L82, L83 and L84 are not interchangeable solely because each is a 5.3L.

Non-AFM or Non-DFM configurations require the hardware and calibration specified for the ordered build. Tell us about existing modifications and your intended use.

Actual LT engine assembly on the Big 3 shop bench
Real Big 3 shop work. This illustrates our engine assembly work, not a promise that the pictured unit is an L83 or that accessories are included.

From the bench to the next build

See what goes into it.

Get closer to the assemblies, the details and the preparation behind our shop work. Start with the engine you need; we’ll help settle the exact combination.

LT long-block assembly on the Big 3 workbench
Crankshaft and connecting-rod assembly detail
LT cylinder heads and rocker assembly
A closer look at the LT valvetrain
Wrapped LT engine on its shipping support

Have a project in mind?

Tell us what you drive and what you want to change.

Find your engineTalk to Big 3 · 903-262-9502

Actual Big 3 shop projects shown. Photos illustrate different jobs and stages of work; included parts, fitment, finish and services are defined by your selected listing or written quote.

LT long-block assembly on the Big 3 workbench

LT long-block assembly on the Big 3 workbench

Choose your L83 build

Open the exact engine listing for current price, specifications and coverage. Use its Place Order or Request Quote option to continue. Customer-core rebuilding requires a rebuildable engine supplied by you.

Prices and product photographs below come from the linked catalog listings. Prices are rounded to whole dollars here; the product page and checkout show the exact amount. Product prices exclude installation, tax, freight and separately quoted core charges unless the selected offer expressly includes them. Confirm VIN, availability and the written build scope before ordering.

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Help me choose my L83 engine

Match the build to the job

Recycled

A used-engine option when budget and availability drive the decision. Mileage, condition, included equipment and warranty belong to the selected listing.

Rebuild or replacement

For an application-matched repair, compare customer-core rebuilding with the replacement long blocks offered for your engine. Inspection and the written build scope determine what is renewed or reconditioned.

Upgraded components

Where listed, enhanced, premium and new-component builds offer different component packages. Compare the actual parts list, not the tier name alone. Performance use needs its own configuration review.

Precision work with a defined scope

ETI Performance LLC provides full-service machine work using Van Norman and Sunnen equipment. Engine rebuilding includes application review, disassembly and cleaning, inspection and measurement, the agreed machining and component work, and assembly checks. The operations required depend on condition and the selected build.

Katech cylinder-head porting on Rottler CNC equipment and Spintron testing are available for selected work. Neither is automatically included in every replacement engine.

Long-block assembly in the Big 3 shop
Actual shop assembly. Exact engine, components and testing depend on your order.

L83 performance build options

Planning upgrades to your L83 5.3L? Compare dedicated RaceKing, Shock Factor and Atlas packages, plus 5.3-based Captain Bligh, Tony Montana and Grudge Boss strokers. Stroker versions finish at 383 ci / 6.28L; the other versions retain stock displacement.

Each 5.3-based package is priced $600 below its corresponding larger-displacement series offering. Open the exact listing for its current price, components and application requirements.

Prices and product photographs below come from the linked catalog listings. Prices are rounded to whole dollars here; the product page and checkout show the exact amount. Product prices exclude installation, tax, freight and separately quoted core charges unless the selected offer expressly includes them. Confirm VIN, availability and the written build scope before ordering.

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Help me choose my L83 performance engine

Allow eight weeks for Shock Factor and stock-displacement Atlas, or fourteen weeks for RaceKing and 383 ci stroker builds. Freight transit is additional. These performance engines have one-year limited parts-only coverage and no core requirement.

Help me choose my L83 performance engine

Warranty, core and delivery

Warranty is product-specific. A recycled engine, Big 3 rebuilt engine and performance component do not automatically share coverage. Review the selected product and controlling written terms for duration, mileage, parts/labor scope, installation requirements and maintenance instructions.

Confirm core charges, return requirements, freight and availability before ordering. Texas installation and nationwide vehicle transportation can be quoted separately.

2014 and newer GM trucks & SUVs

Start with your engine code

Shopping for a 5.3L or 6.2L replacement? These LT-family pages compare actual product options. Model years change at different times across pickups and SUVs. A Denali badge, shared displacement or similar photograph does not establish interchange. Confirm the VIN, engine code and original configuration first.

These are family-selection links, not a fitment list for every vehicle on this page. Older LS-family engines, HD trucks, diesels and specialty configurations need their own identification.

Need a transmission instead?

Send the VIN, transmission code or identification-label photo, engine details and 2WD/4WD configuration. Confirm the supplied converter, controls, programming, cooling-system work and installation scope in the quote. Engine displacement alone is not enough to select a transmission.

Compare the complete repair cost

Compare the exact assembly price with installation, transferred accessories, required repairs and delivery. Core deposits are individually quoted and collected separately. Multiple engines, transmissions or mixed freight items require a shipping quote.