1999 Used Chevy Engines For Sale | Auto Power Source

107
verified 1999 Chevy engines
Trustpilot
Customer Reviews
Up to 3 yrs
extended warranty available
Photos before
shipment

1999 Used Chevy Engines For Sale

1999 is the year two complete Chevy truck line-ups overlap: the new GMT800 Silverado arrives on the Gen III small block while the C/K, Suburban and Tahoe carry on with the Vortec 5700 L31, the 7.4L L29 and the 6.5L turbo diesel. We hold 107 verified 1999 Chevy engines across both. Text us your VIN and we will tell you which one is yours.

●
Warranty On Every Unit
●
Photos Before Shipment
●
ASE-Tested & Verified
●
Free Nationwide Shipping
●
30-Day Money-Back
●
Secure SSL Checkout

1999 Chevy Engine Families

Which engine sits under which 1999 Chevy, and how many of each we hold today.

Engine family Fits (1999) In stock
5.7L L31 Vortec 5700 V8, VIN R C/K 1500-3500, Suburban, Tahoe, Express, gasoline and CNG 31
4.3L Vortec 4300 V6, LU3 VIN W and high-output VIN X Astro, Blazer, Jimmy, S10, Sonoma, Express, Silverado 1500 20
6.5L Turbo Diesel V8, L65 VIN F and L56 VIN S C/K 2500-3500, Suburban, Tahoe, Express 2500-3500 15
7.4L L29 Vortec 7400 V8, VIN J C/K 2500-3500, C3500HD, Suburban 2500, Express 3500 10
Gen III Small Block V8, truck 4.8L LR4 VIN V, 5.3L LM7 VIN T, 6.0L LQ4 VIN U, car 5.7L LS1 VIN G New-style GMT800 Silverado 1500 and 2500, Camaro Z28, Corvette C5 7
5.0L L30 Vortec 5000 V8, VIN M C1500, K1500, Express 1500-2500, 1500 Series 5
2.2L OHV Four, VIN 4 Cavalier, S10, Sonoma, gasoline and CNG opt KL6 5
60-Degree V6, 3.1L LG8 VIN M Federal and VIN J California, 3.4L LA1 VIN E Malibu, Lumina, Monte Carlo, Venture 5
Captive-Import Four, Metro 1.0L VIN 6 and 1.3L VIN 2, Prizm 1.8L VIN 8, Tracker 2.0L VIN C Metro, Prizm, Tracker 4
3.8L L36 3800 Series II V6, VIN K Camaro, Lumina, Monte Carlo 3
2.4L LD9 Twin Cam Four, VIN T Cavalier, Malibu 2
Total 107

Other Chevy Model Years

Every model year we hold Chevy engines for. Years without a link are in stock but have no year page yet — text us your VIN.

20242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
1998
1997
1996
1995
1994
1993
1992
1991
1990

Why Buy a 1999 Chevy Engine from Auto Power Source

Every 1999 Chevy engine listed here is a real unit on our floor, not a catalogue entry. Each is ASE-certified-technician tested, compression-tested and leak-down checked, photographed from multiple angles, and matched to your vehicle before we take payment. The count on this page is the live active count, so what you see is what we can ship.

1999 is the hardest Chevy year to order blind. GM sold the new-style GMT800 Silverado 1500 and 2500 alongside the carried-over GMT400 C/K trucks, and the two use different engine families: Gen III 4.8L LR4, 5.3L LM7 and 6.0L LQ4 in the new truck, iron Vortec 5700 L31 and 7.4L L29 in the old one. They are not interchangeable, and the badge does not tell you which you have. The 8th VIN digit does.

The 4.3L Vortec 4300 V6 is the volume engine of the year and it splits two ways: VIN W is the standard LU3, VIN X the high-output version fitted to some S10 and Sonoma trucks. The Express van adds a second trap: the 4.3L came with two bell-housing bolt patterns, ID ABA/ABC standard and ID UBA/UBC metric, and the wrong one will not bolt to your transmission. We carry both and check the ID code against your VIN.

On the diesel side, the 6.5L turbo diesel V8 comes as the L65 (VIN F) in the C/K trucks, Suburbans and Express vans, and as the L56 (VIN S) in the Tahoe. We also stock bi-fuel CNG versions of the 5.7L L31 and the 2.2L four (option KL6), rare units most sellers cannot source at all.

Every engine ships with free freight to the lower 48, a warranty of up to three years, and a money-back guarantee. If the unit does not match what we promised, it comes back at our cost. Call 1-877-313-8995, text +1-307-441-5554, or email info@autopowersource.com and a real person will work the match with you.

📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →

Your 1999 Chevy Engine Options: Compared

Most 1999 Chevy owners face four real choices when the engine fails:

← Swipe sideways to see all columns →
Option Cost Reliability Warranty Fitment Match
Used OEM (this collection) $$$ Best Value High — tested Included VIN-matched
New OEM (dealer) $$$$$ 2-4× more High Manufacturer Exact
Aftermarket / Reman $$$$ Varies 6-12 mo May adapt
Junkyard $ Cheapest Unknown None DIY

Tested used OEM hits the sweet spot — same engineering as new, fraction of the cost.

1999 Chevy Engine Buying Guide

5 things to verify before buying a used 1999 Chevy engine:

  1. New style or classic? In 1999 the GMT800 Silverado 1500/2500 and the GMT400 C1500-C3500 were sold side by side. The new truck runs Gen III 4.8L LR4, 5.3L LM7 or 6.0L LQ4; the classic truck runs 5.0L L30, 5.7L L31 or 7.4L L29. Settle this first; nothing else in the match works until you have.
  2. Read the 8th VIN digit, not the badge. GM reused displacements across families this year. VIN M is a 5.0L L30 V8 on a C1500 but a 3.1L LG8 V6 on a Malibu; VIN T is a 5.3L LM7 on a Silverado but a 2.4L LD9 four on a Cavalier; VIN J is a 7.4L L29 on a K3500 but a California-emissions 3.1L on a Lumina. Displacement plus VIN digit together identify the engine; neither alone does.
  3. Express vans: check the bell-housing ID code. The 1999 4.3L in the Express 1500-3500 shipped with two bolt patterns. ID ABA and ABC are the standard pattern; ID UBA and UBC are metric. They do not interchange. The code is cast on the block and we verify it before shipping.
  4. Fuel system: gasoline, CNG or diesel. The 5.7L L31 and the 2.2L four were both offered as factory bi-fuel CNG units (option KL6 on the four), and the 6.5L turbo diesel came as the L65 VIN F or the Tahoe-specific L56 VIN S. A CNG block carries different heads, injectors and valve seats to its gasoline twin, so the fuel type is part of the part number, not an option.
  5. Confirm the match with your own VIN before you order. Send us the 17-character VIN off your own vehicle and our technicians will confirm the engine family, displacement, emissions calibration and accessory fitment against it before any unit ships. It takes a few minutes and it is the only way to be certain.

Our ASE-certified technicians verify every one of these points against your VIN before any unit ships.

📞 Need help choosing the right 1999 Chevy engine? Talk to our team live.Call 1-877-313-8995

Frequently Asked Questions

How many 1999 Chevy engines do you have in stock right now?
107, the live count of active listings on this page, taken from our own inventory rather than a catalogue. The biggest group is the 5.7L L31 Vortec 5700 V8 at 31 units, then the 4.3L Vortec 4300 V6 at 20 and the 6.5L turbo diesel at 15.
What is the difference between the 1999 Silverado and the 1999 C1500?
Two different trucks sold in the same year. The Silverado 1500 and 2500 are the new GMT800 platform on the Gen III small block: 4.8L LR4 (VIN V), 5.3L LM7 (VIN T), 6.0L LQ4 (VIN U). The C1500-C3500 and K-series equivalents are carried-over GMT400 trucks on the 5.0L L30, 5.7L L31 and 7.4L L29. They do not interchange.
My 1999 Chevy has a 4.3L V6. Is there more than one version?
Yes. VIN W is the standard LU3 Vortec 4300; VIN X the high-output version used in some S10 and Sonoma trucks. On the Express vans there is a further split by bell-housing bolt pattern, ID ABA/ABC standard versus ID UBA/UBC metric. We match it to your VIN.
Do you have the 6.5L turbo diesel for a 1999 Tahoe?
Yes. The Tahoe diesel is the L56, 8th VIN digit S, distinct from the L65 (VIN F) used in the C/K trucks, Suburbans and Express vans. We stock 15 units across both codes and confirm which yours takes from the VIN.
Can I still get a CNG 1999 Chevy engine?
We do stock them. Chevy offered factory bi-fuel compressed-natural-gas versions of the 5.7L L31 V8 and the 2.2L four (option KL6), and those blocks use different heads, valve seats and injectors from the gasoline versions. Tell us up front if your vehicle is a CNG unit.
What warranty comes with a 1999 Chevy engine?
Coverage runs up to three years depending on the unit and application, and every engine carries our money-back guarantee. Freight to the lower 48 is free. Exact coverage for your matched unit is confirmed in writing before you pay.
How is the engine tested before it ships?
Each unit is inspected by ASE-certified technicians, compression-tested and leak-down checked, then photographed from multiple angles. You see photographs of your specific unit before it leaves the warehouse, not a stock image.
What is the fastest way to get a quote?
Text your VIN to +1-307-441-5554 and we will come back with the matching options, usually within minutes. Or call 1-877-313-8995 or email info@autopowersource.com.
🏆 Earn $500 with Our Rewards Program
Every Chevy engine you buy earns rewards. 10 orders (yours or referred) = $500 cash credit. Silver, Gold, and Platinum tiers with discounts, priority support, and private inventory access.
See How Rewards Work →
100K+
Engines+Transmissions In Stock
0%
fitment-related returns
All 50
states covered, free freight
36
brands covered

Our 6-Step Inspection & Shipping Process

Every 1999 Chevy engine we ship has been through these six steps:

1. VIN-Matching
We match the donor VIN to your VIN to confirm engine/transmission code, emissions calibration, and drivetrain fit.
2. Tested & Verified
ASE-certified technicians compression-test every cylinder and run leak-down evaluation on engines. Transmissions are Shift-Tested through all gears.
3. Noise & Smoke Verification
Units are run to verify normal mechanical sound and clean operation — catches internal wear static tests miss.
4. Visual Inspection
Every accessible component is inspected: turbos, manifolds, valve covers, housings, accessories, sensor harnesses.
5. Photograph & Catalog
Multi-angle photos sent to you BEFORE we ship for your approval.
6. Palletize & Ship
Strapped on a heavy-duty wooden pallet, shipped via freight at no charge.

Our Photos-Before-Shipment Guarantee

Before any 1999 Chevy engine leaves our warehouse, we send you multi-angle photographs. You approve. If you do not approve, you get every dollar back — no questions, no restocking fees, no return freight charges. On top of 30-day money-back and the warranty included with every unit. Browse all 107 1999 Chevy engines below.

✉ Email Us at info@autopowersource.com
No match? Text VIN →