- Regular price
- $3,999.00
- Regular price
-
- Sale price
- $3,999.00
- Unit price
- per
Remanufactured GM 4.3L EcoTec3 LV3 long-block engine for verified 2014–2021 Chevrolet Silverado 1500 and GMC Sierra 1500 applications. Built to order using a sourced core; this is not a service to rebuild the engine you send us.
No core charge · Free lower-48 commercial dock/forklift or terminal delivery · Included 1-year unlimited-mile engine-only warranty (no labor).
Contact us for current build time and availability. Confirm the full VIN and original engine configuration before ordering.
Fitment
| Model / application | Model years | Engine / configuration | VIN engine code (8th character) |
|---|---|---|---|
| Chevrolet Silverado 1500 | 2014–2018 | 4.3L EcoTec3 V6; RPO LV3. Original 2014-generation 1500 body; factory LV3 only. | H |
| Chevrolet Silverado 1500 | 2019–2021 | 4.3L EcoTec3 V6; RPO LV3. New-body 1500; excludes 2019 Silverado LD/Sierra Limited. | H |
| GMC Sierra 1500 | 2014–2018 | 4.3L EcoTec3 V6; RPO LV3. Original 2014-generation 1500 body; factory LV3 only. | H |
| GMC Sierra 1500 | 2019–2021 | 4.3L EcoTec3 V6; RPO LV3. New-body 1500; excludes 2019 Silverado LD/Sierra Limited. | H |
Fitment verification: LV3 is the GM engine RPO; H is the eighth VIN character for the listed factory applications. Neither a 4.3L casting mark nor VIN H alone proves complete long-block interchange. Send the full 17-character VIN, build date and emissions information so the correct engine assembly can be matched.
Important version differences and exclusions
- 2019 body-style distinction: the LV3 application shown is the new-body Silverado/Sierra 1500. The 2019 Silverado LD and Sierra Limited are not included; GM's model-specific VIN pages list the 5.3L L83 for those carryover trucks.
- LV3 versus LV1: factory LV3 has gasoline direct injection, variable valve timing and Active Fuel Management (AFM), not Dynamic Fuel Management (DFM). GM identifies LV1 applications as having no AFM hardware. LV1 / VIN P applications, including Express/Savana vans, are not covered as automatic replacements by this LV3 listing.
- Not the older Vortec: older 4.3L LU3/L35-family engines are not established interchange with this Gen V direct-injected engine. Do not order by displacement or the Vortec/EcoTec name alone.
- No AFM/DOD delete, DFM conversion, tuning change, performance upgrade or particular upgraded component is promised. Match the correct valvetrain, fuel-control, emissions and application-specific external components.
- 2022 and later model years, HD 2500/3500 trucks and other models not shown are not included in this listing; separate fitment and assembly verification is required.
Block codes and engine identification
| Identifier | Reference / location | Limit |
|---|---|---|
| Cylinder-block casting | 12633129 | Documented LV3 casting reference in ATK's manufacturer catalog and remanufacturer data. Read the complete raised number on the actual cylinder block. This does not identify a unique model year or prove LV1 interchange. |
| Cylinder-head casting | Confirm the full number on each actual head | Published supplier head-code references conflict. No specific head casting or universal model-year casting crosswalk is guaranteed. Verify the complete actual numbers against the required assembly and build records; do not substitute a shortened catalog number. Head castings are distinct from the block casting. |
| Engine traceability / donor ID | Traceability label at rear of left cylinder head; VIN derivative at left rear of block | GM service information describes a typically nine-character stamped/laser-etched VIN derivative. Record the entire label and stamp, including the engine-family/RPO and assembly information where present. These are distinct from a raised casting, service-engine part number or the vehicle's full VIN. |
Original identification marks on a sourced-core remanufactured engine can identify the donor rather than the buyer's vehicle. The finished assembly must still be matched to the buyer's VIN. If original marks are missing, confirm the core/build records and installed components. Photos or casting numbers alone do not establish the engine's exact year, RPO or AFM configuration.
Long-block scope
Intake manifold and bolt-on accessories are not included. Confirm the supplied assembly and any application-specific external fuel-system components before installation; do not assume every item visible in a photo is included. Any photos supplied for this listing are representative; configuration varies by VIN and photographs do not independently establish exact fitment.
Delivery type
- Business with dock/forklift or terminal pickup: free
- Business without dock (lift gate): +$100
- Residential (includes lift gate): +$300
These terms apply within the contiguous lower 48 United States. If the delivery address does not match the delivery type selected, the difference will be charged before shipping. Contact us before ordering outside the lower 48; Alaska and Hawaii engine orders require a freight quote rather than online checkout.
Break-in
Follow our engine break-in procedure and installation requirements to maintain your warranty.
Warranty and core
Warranty: included 1-year unlimited-mile engine-only warranty. The standard warranty does not cover labor. Coverage, exclusions and claim requirements are governed by our Warranty & Refund Policy.
Core charge: none. This is a sourced-core, built-to-order long block; you do not send your engine to us for rebuilding.
Questions about fitment? Contact us before ordering.
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