44
verified 1990 gmc engines
1990 Used GMC Engines For Sale
44 verified 1990 GMC engines in stock — full-size C/K trucks and Suburbans (8-350 5.7L, 8-454 7.4L, and the 8-379 6.2L diesel), S10/S15/Sonoma and Jimmy compacts (6-173 2.8L, 6-262 4.3L), Safari and full-size Vans (4.3L, 5.0L, 5.7L), and Forward Control chassis units. Each engine is VIN-matched to your vehicle, compression-tested by ASE-certified technicians, photographed before shipment, and backed by up to a 3-year warranty plus 30-day money-back. Free freight nationwide.
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Compression-Tested & Verified
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Free Nationwide Shipping
Browse 1990 GMC Engines by Model
Match your 1990 GMC engine by vehicle. Use the cards below to identify the right body style and displacement — every unit is then VIN-matched at the order step. Not sure which engine code fits? Text us your VIN and a specialist confirms the match.
1990 C/K Truck — 2500 & 3500
Full-size pickups: 8-350 (5.7L), 8-454 (7.4L), and the 8-379 (6.2L) diesel. The VIN 8th digit sets the engine — confirm 2500 vs 3500 and gas vs diesel.
1990 Suburban — 1500 & 2500
8-350 (5.7L) gas and 8-379 (6.2L) diesel, plus 8-454 (7.4L) on the 2500. Full-size SUV; match the 5th-digit body code and fitment range.
1990 Jimmy — Full-Size & S10/S15
Full-size Jimmy runs 8-350 (5.7L) / 8-379 (6.2L diesel); compact S10/S15 Jimmy uses the 6-262 (4.3L V6), 4x2 or 4x4.
1990 S10/S15/Sonoma Pickup
Compact-truck engines: 6-173 (2.8L) and 6-262 (4.3L V6), available 4x2 or 4x4. Verify the VIN 8th digit before ordering.
1990 Safari Van
6-262 (4.3L) V6, VIN B or VIN Z (8th digit), in 4x2 or AWD. The mid-size GMC van engine, tested and warrantied.
1990 Van — 1500 / 2500 / 3500
Full-size cargo and passenger van engines: 6-262 (4.3L), 8-305 (5.0L), and 8-350 (5.7L). Match the series and VIN 8th digit.
1990 Forward Control
Stripped-chassis engines: 6-262 (4.3L), 8-350 (5.7L), 8-454 (7.4L), and 8-379 (6.2L) diesel, MT or AT.
Why Buy a 1990 GMC Engine from Auto Power Source
Every 1990 GMC engine in our inventory is pulled from an inventory-verified donor vehicle, cataloged by VIN, and held in our warehouse pending sale. Each unit goes through our six-step inspection — VIN-matching, compression testing, noise & smoke verification, full visual inspection, multi-angle photography, and palletized shipping. The 1990 GM small-block and big-block families are some of the most serviceable engines ever built, and we keep both the gasoline 4.3L/5.0L/5.7L/7.4L units and the 6.2L diesel in stock.
Our ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before any 1990 GMC engine is cleared for sale. You pay a fraction of dealer-new or rebuild pricing for the same proven GM engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and get up to a 3-year warranty plus 30-day money-back. Not sure whether you need the gas or diesel block? Text your VIN and we will confirm.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 1990 GMC Engine Options: Compared
Most 1990 GMC owners face four real choices when their engine fails:
← Swipe sideways to see all columns →
| Option |
Cost |
Reliability |
Warranty |
Fitment Match |
| Used OEM (this collection) |
$$$ Best Value |
High |
Up to 3 years |
VIN-matched |
| New OEM (dealer) |
$$$$$ 2-4× more |
High |
Manufacturer |
Exact |
| Aftermarket / Reman |
$$$$ |
Varies |
6-12 mo |
May adapt |
| Junkyard |
$ Cheapest |
Unknown |
None |
DIY |
Tested used OEM hits the sweet spot — same proven GM engineering as new, fraction of the cost.
1990 GMC Engine Buying Guide
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Read the 8th-digit VIN engine code. On 1990 GMC trucks this distinguishes the 4.3L (Z), 5.0L (H), 5.7L (K), 7.4L (N), and 6.2L diesel (C/J) — same family, different engine.
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Decide gas vs diesel. The 8-379 (6.2L) diesel is a completely different block from the gasoline small-blocks; mounts, accessories, and wiring do not interchange.
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Match the drivetrain (4x2 / 4x4 / AWD). S10/S15, Jimmy, and Safari units ship in multiple drivetrains — brackets and accessory placement differ.
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Confirm the series and fitment range. 1500 / 2500 / 3500 and "(2000 Down)" / "(2001 Down)" fitment notes tell you which body the engine was cataloged to.
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Always run the donor VIN if available. We provide it on request for any engine in our inventory to verify mileage and history.
Our ASE-certified technicians verify every one of these points against your VIN before any engine ships.
Frequently Asked Questions
What is the warranty on a 1990 GMC engine?
Up to 3 years, depending on the specific unit. The exact warranty term is listed on each product page.
What does compression-tested mean?
ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before any 1990 GMC engine is cleared for sale.
How long until delivery?
Prep and ship time is 3-5 business days. Transit time is 2-3 business days via freight carrier after dispatch.
Can I see photos before I buy?
Yes. Multi-angle photos of the actual unit are sent for your approval before payment.
Do I need my VIN?
Strongly recommended. 1990 GMC engines vary by displacement, gas vs diesel, drivetrain, and series — the VIN confirms the exact match.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
Why is a used OEM engine cheaper than the dealer?
You get the same proven GM engineering from a verified donor unit without new-part markup — a fraction of dealer-new or full-rebuild pricing, with a warranty behind it.
When can I reach customer service?
Our team is available 24 hours a day, Monday through Saturday, by phone at 1-877-313-8995 or by text.
46,000+
engines + transmissions shipped
0%
fitment-related returns
All 50
states covered, free freight
Excellent
Customer Reviews
rated on Trustpilot
Our 6-Step Inspection & Shipping Process
Every 1990 GMC engine we ship has been through these six steps:
1. VIN-MatchingWe match the donor VIN to your VIN to confirm engine code, emissions calibration, and drivetrain fit.
2. Tested & VerifiedASE-certified technicians compression-test every cylinder and run a leak-down evaluation on each engine.
3. Noise & Smoke VerificationUnits are run to verify normal mechanical sound and clean operation — catches wear static tests miss.
4. Visual InspectionEvery accessible component is inspected: manifolds, valve covers, accessories, and sensor harnesses.
5. Photograph & CatalogMulti-angle photos sent to you BEFORE we ship, for your approval.
6. Palletize & ShipStrapped on a heavy-duty wooden pallet, shipped via freight at no charge.
What Our Customers Say
Rated Excellent by our customers on Trustpilot.
★★★★★
Transaction was perfect
"Found me the right engine at a great price. Got it in 2 days and installed the car the next day. Runs absolutely beautiful."
— Kevin Graham, 2026-04-29
★★★★★
Repeat customer
"AutoPowerSource is a great company. I've used them several times for used motors. Low mileage when other companies gave up."
— Curtis Haines, 2025-12-23
★★★★★
Highly recommend
"Reached out first thing in the morning regarding my inquiry for a used engine. Very informative and helpful throughout."
— Beatrice, 2026-03-31
★★★★★
Great experience
"Daisy kept me in the loop every step. My original engine was damaged before shipping; she found a different one quickly."
— Bryan Perkins, 2026-03-25
Our Photos-Before-Shipment Guarantee
Before any 1990 GMC 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 up to a 3-year warranty.
✉ Email Us at info@autopowersource.com
