LT4 6.2L engine: specs, donor vehicles & swap notes
The LT4 is a 6.2 L aluminum-block Generation V engine built 2015–present, rated 640–682 hp. It came in 6 vehicle applications, including Chevrolet Corvette Z06, Cadillac CTS-V. Things to know: it has AFM, so an aftermarket cam means a full AFM delete; it has variable valve timing; it is direct-injected (Gen V parts and controller).
| Spec | Value |
|---|---|
| RPO | LT4 |
| Family | Generation V |
| Years | 2015–present |
| Displacement | 6.2 L / 376 ci |
| Horsepower | 640–682 hp |
| Torque | 630–659 lb-ft |
| Bore × stroke | 4.065 × 3.622 in |
| Compression | 10.00:1 |
| Block | aluminum |
| AFM/DOD | Yes |
| Reluctor | 58x |
| Throttle | Drive-by-wire |
| Firing order | 1-8-7-2-6-5-4-3 |
| Computer | E92 (HP Tuners,.hpt) |
We tune and review logs for the LT4
Gen V LT on HP Tuners. Send your E92 .hpt and logs. The free Tune Report tells you what to fix first, in plain English, within 1 business day of getting your file. Full Custom is built from your logs.
Free Tune Report Full Custom from $199
LT reports use the same format as the LS sample. The free turn-on values are LS swap tools only; LT owners start with the Tune Report or Full Custom.
- AFM lifter collapse/sticking causing misfire. Fix: Replace the valve lifter oil manifold and the affected bank of lifters (GM bulletin 15-06-01-002A); AFM delete/tune-out prevents recurrence.
- Charge air cooler air-lock after service (reduced performance, P0300 misfire). Fix: Drain and fill the charge air cooling system using vacuum-fill special tools (GM bulletin 18-NA-088).
- Direct-injection intake valve carbon buildup. Fix: Walnut-blast intake valves and ports; quality fuel and frequent oil changes slow buildup.
Aluminum, supercharger, supercharger (Escalade-V), VVT, AFM, DI, dry sump (Corvette)
The LT4 specs above are not yet confirmed against GM documents; GM ratings varied by year and vehicle.
How the LT4 differs from the other 6.2 L Gen V engines
The LT4 is one of the six 6.2 L Gen V engines we list: L86, L87, LT1, LT2, LT4, LT5. From our engine table:
- AFM (cylinder deactivation): yes. Same as the L86, L87, LT1, LT2; the LT5 doesn't.
- Compression 10.00:1, tied with the LT5 for the lowest of the group.
- Up to 682 hp from the factory (2nd of the six 6.2 L Gen V engines we list; the group tops out at 755 hp).
- Variable valve timing. Also on the L86, L87, LT1, LT2, LT5.
- Built 2015–present.
Swapping the LT4: what to plan for
- Computer: the LT4 is a Gen V direct-injection engine, so it needs a Gen V computer or a Gen V-specific aftermarket kit; Gen III/IV harnesses and computers don't run it. More: LS swap ECU comparison.
- Drive-by-wire throttle: plan on the pedal and throttle body that match the LT4 and its computer.
- AFM (cylinder deactivation): an aftermarket cam on the LT4 means a delete kit made for Gen V engines, plus the tune.
- Dry sump on some Corvettes (by package; other applications are wet sump): check your donor's oil system. If it is dry sump, plan room for the tank and lines, or a wet-sump conversion (pan, pickup and pump made for it). More: oil pans.
- Factory supercharged: the intercooler pump and front heat exchanger come with it, so plan space ahead of the radiator, and plan the fuel system for boost. More: fuel system sizing.
Refresh parts for the LT4
From our Gen V refresh list, the parts that are specific to the LT4. Seals, gaskets and the upgrades worth doing on any Gen V with the engine out are in the full refresh list, next to every torque spec.
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| Part | GM part # | Why for this engine |
|---|---|---|
| OEM-style Gen V LT4 head gasket | 12654622 | Listed for the LT4; a new gasket goes on any time the heads come off. |
| GM Gen V LT knock sensor 12623095 | 12623095 | Gen V knock sensor, as on the LT4. |
| GM Gen V LT camshaft position sensor 12623093 | 12623093 | Gen V cam sensor for the LT4. |
| GM Gen V LT crankshaft position sensor 12669636 | 12669636 | Gen V crank sensor for the LT4. |
| OEM-style LT Gen 5 cylinder head bolt kit | 11611976 | GM head bolts for Gen V engines like the LT4; check the part number for yours. |
Donor vehicles with the LT4
Where to find an LT4 at the junkyard: 6 vehicle applications below. Confirm it from the RPO sticker in the glovebox or the 8th VIN digit.
| Vehicle | Years |
|---|---|
| Arash AF10 Hybrid | 2016–present |
| Cadillac CT5-V Blackwing | 2022–present |
| Cadillac CTS-V | 2016–2019 |
| Cadillac Escalade-V | 2023–present |
| Chevrolet Camaro ZL1 | 2017–2024 |
| Chevrolet Corvette Z06 | 2015–2019 |
Buying a used LT4
A used LT4 has no single part number, so this page does not link a search. Confirm the engine from the RPO sticker or the 8th VIN digit before you buy.