51
verified 1991 gmc engines
1991 Used GMC Engines For Sale
51 verified 1991 GMC engines in stock — full-size C/K 2500 & 3500 pickups (5.7L 350, 7.4L 454, 5.0L 305, 6.2L diesel), S-15/Sonoma & Jimmy (2.5L, 2.8L, 4.3L), the turbocharged Syclone, plus Suburban, Safari and Vandura/Rally vans. VIN-matched to your vehicle, compression-tested by ASE-certified technicians, photographed before shipment, 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 1991 GMC Engines by Model
Pick your 1991 GMC model to see exact fitments in stock. Not sure which engine code fits? Text us your VIN and a specialist confirms the match — every unit is VIN-matched at the order step.
1991 C/K 2500 & 3500 Pickups
5.7L 350 (VIN K), 7.4L 454 (VIN N), 5.0L 305 (VIN H), and 6.2L diesel (VIN J / VIN C, EGR & non-EGR). Full-size workhorse engines — gas and diesel, MT and AT.
1991 S-15 / Sonoma / S10
4-151 (2.5L, VIN A / VIN E), 6-173 (2.8L, VIN R), and 6-262 (4.3L, VIN Z) in 4x2 / 4x4. Compact-pickup four- and six-cylinders.
1991 GMC Syclone
The turbocharged 6-262 (4.3L, VIN Z) from the legendary all-wheel-drive Syclone — a distinct high-output engine. Verify the VIN before ordering.
1991 Jimmy (Full-Size & Compact)
Compact Jimmy / S10/S15 4.3L (6-262, VIN Z), 4x2 & 4x4; full-size Jimmy 5.7L 350 (VIN K) and 6.2L diesel (VIN C). Confirm body style by VIN.
1991 Suburban (1500 & 2500)
5.7L 350 (VIN K) gas and CNG, 7.4L 454 (VIN N), and 6.2L diesel (VIN J / VIN C). Half-ton (1500) and three-quarter-ton (2500) fitments.
1991 Vans — Vandura / Rally & Safari
G1500–G3500: 6-262 (4.3L), 8-305 (5.0L), 8-350 (5.7L gas & CNG), and 8-454 (7.4L). Plus Safari Van 4.3L (VIN B), 4x2 — cargo and passenger vans.
Why Buy a 1991 GMC Engine from Auto Power Source
Every 1991 GMC engine in our inventory is pulled from a low-mileage donor vehicle, cataloged by VIN, and held in our climate-controlled warehouse pending sale. These are the GM small-block 350, big-block 454, the rugged 6.2L diesel, the 4.3L Vortec V6, and even the turbocharged 4.3L from the all-wheel-drive Syclone — architectures known for going hundreds of thousands of miles when properly maintained. Each unit goes through our six-step inspection: VIN-matching, compression testing, noise & smoke verification, full visual inspection, multi-angle photography, and palletized shipping.
Our ASE-certified technicians compression-test every cylinder and run a leak-down evaluation before any 1991 GMC engine is cleared for sale. You pay a fraction of dealer-new pricing for the same 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 have a naturally-aspirated 4.3L or the turbocharged Syclone unit, or a gas 350 versus a 6.2L diesel? Text your VIN and we will confirm.
📱 Fastest way to match: text us your VIN, get options in minutes.Text Your VIN →
Your 1991 GMC Engine Options: Compared
Most 1991 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 GM engineering as new, fraction of the cost.
1991 GMC Engine Buying Guide
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Confirm the 8th-digit VIN engine code. 1991 GMC uses it to separate 4-151 (2.5L), 6-173 (2.8L), 6-262 (4.3L), 8-305 (5.0L), 8-350 (5.7L), 8-379 (6.2L diesel), and 8-454 (7.4L).
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Separate gas from diesel. The 6.2L (VIN J / VIN C) diesel — including EGR and non-EGR versions — is an entirely different block from the gas 350, 305, and 454, and never interchangeable.
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Watch for the turbocharged Syclone 4.3L. The Syclone's 6-262 is a high-output turbo engine, distinct from the standard naturally-aspirated 4.3L — do not substitute one for the other.
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Match drivetrain and transmission. 4x2 vs 4x4 and MT vs AT change oil pans, bell-housings, and output configuration — especially on the diesels and Safari AWD vans.
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Note CNG-prepped units. Several 1991 Vandura/Rally, Suburban, and 2500/3500 engines were factory CNG — verify the fuel system before ordering. Run the donor VIN (we provide it on request) to confirm 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 1991 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 the engine is cleared for sale, plus noise & smoke verification on the run stand.
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 before payment.
Do I need my VIN?
Strongly recommended. 1991 GMC engines vary by displacement, gas vs diesel, naturally-aspirated vs the turbo Syclone 4.3L, and drivetrain — the VIN pins the exact match.
What if I do not approve the photos?
Every dollar back — no restocking fees, no return freight charges.
Why cheaper than dealer new?
Used OEM from low-mileage donors. Same GM engineering as new, at a fraction of the cost.
When can I reach customer service?
24 hours Monday through Saturday.
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 1991 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, gas and diesel alike.
4. Visual InspectionEvery accessible component is inspected: manifolds, injection pumps, valve covers, accessories, 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 Mike
"Mike reached out first thing in the morning regarding my inquiry for a used engine. Very informative and helpful."
— 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 1991 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
