LC8 6.0L engine: specs, donor vehicles & swap notes
The LC8 is a 6.0 L iron-block Generation IV engine built 2010–2020, rated 342 hp. Things to know: it has variable valve timing.
| Spec | Value |
|---|---|
| RPO | LC8 |
| Family | Generation IV |
| Years | 2010–2020 |
| Displacement | 6.0 L / 364 ci |
| Horsepower | 342 hp |
| Torque | 373 lb-ft |
| Bore × stroke | 4.0 × 3.622 in |
| Compression | 9.70:1 |
| Block | iron |
| AFM/DOD | No |
| VIN 8th digit | B |
| Reluctor | 58x |
| Stock cam | Duration 198°/208° @.050 in. int./exh.; valve lift 0.467"/0.479" int./exh.; 116° LSA; 1-bolt gear, 4x; AFM No, VVT Yes. |
| Firing order | 1-8-7-2-6-5-4-3 |
| Head casting | 5364, 823 |
- Weak cast pistons. Fix: A set of forged pistons should be high on your priority list.
- Tight piston ring gap limits power adders. Fix: Install a 4-corner steam kit to reduce ring-butting hot spots.
- Exhaust manifold bolt failure. Fix: Replace broken bolts with updated hardware during manifold service.
Iron/Alum. heads, VVT, CNG- & LPG-capable
The LC8 specs above are not yet confirmed against GM documents; GM ratings varied by year and vehicle.
How the LC8 differs from the other 6.0 L Gen IV engines
The LC8 is one of the nine 6.0 L Gen IV engines we list: L76, L77, L96, L98, LC8, LFA, LS2, LY6, LZ1. From our engine table:
- Iron block. Among the 6.0 L Gen IV engines, the LC8 shares it with the L96, LY6; the L76, L77, L98, LFA, LS2, LZ1 are aluminum.
- No AFM. The L76, L77, LFA, LZ1 have it, so the LC8 is the easier cam-swap candidate of the group.
- Compression 9.70:1, within the group's 9.6–10.9:1 spread.
- Up to 342 hp from the factory (7th of the nine 6.0 L Gen IV engines we list; the group tops out at 400 hp).
- Variable valve timing. Also on the L76, L96, LY6, LZ1.
- Built 2010–2020.
Swapping the LC8: what to plan for
- Computer: the LC8 has a 58x crank. An E38 or E67 matches it; a 0411/P59 also needs a 58x-to-24x converter box and its own sensor and knock-sensor wiring. Throttle and wiring have to suit the computer too. More: how to wire your LS (the full checklist for your engine and computer).
- VVT: on a VVT LC8 the cam phaser and VVT timing cover change what bolts on: only some water pumps clear a VVT timing cover, and a non-VVT cam needs a VVT delete and a tune. More: accessory drives.
Refresh parts for the LC8
From our Gen IV refresh list, the parts that are specific to the LC8. Seals, gaskets and the upgrades worth doing on any Gen IV 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 |
|---|---|---|
| LSXceleration Gen IV LS knock sensor 28-23730 | 28-23730 | The LC8 has its knock sensors on the side of the block. |
| GM Gen IV camshaft position sensor 12591720 (58x engines) | 12591720 | 58x LC8: the cam sensor lives in the front cover. |
| Chevrolet Performance 58x crankshaft position sensor 12703627 | 12703627 | 58x LC8: the crank sensor is behind the starter. |
From real tunes: 6.0 L on a Gen IV computer
What these settings look like in the 329 naturally aspirated pump-gas tunes for 6.0 L engines on Gen IV computers (E38, E67 and the 24x E40) in our tune library (as of 2026-10-15). Every RPO of this size is pooled, not only the LC8, and so are all cams, heads and builds: that is why the ranges are wide. Use them to spot a value that is far outside what works, not as your numbers.
| Setting | Range | Median | Tunes |
|---|---|---|---|
| Hot idle target | 550 rpm to 850 rpm | 700 rpm | 327 (middle 80%) |
| Warm idle airflow, in gear | 6.0 g/s to 12.3 g/s | 8.0 g/s | 326 (middle 80%) |
| Idle spark (around 800 rpm) | 13° to 20° | 15° | 329 (middle 80%) |
| Power enrichment (PE) lambda | 0.78 to 0.87 | 0.83 | 322 (middle 80%) |
| WOT spark at 5,000 rpm, about 0.9 g/cyl | 12.0° to 25.0° | 19.0° | 329 (middle 80%) |
For starting values matched to your LC8's cam, injectors and fuel, use the turn-on tune builder. Always finish on a dyno, and read our safe tuning limits before any wide-open pass.