6.2L V8 Engine Complete Assembly for 2019-2021 Cadillac, Chevrolet, & GMC

A quick look at your own vehicle makes sure the right engine shows up:

• Check your VIN's 8th Digit: Confirm that the 8th digit is 'L'.
• Verify the RPO Code: Confirm that the code L87 is listed on the SPID label or QR code.
• Confirm Drivetrain Configuration: Check if your truck is 2WD or 4WD to determine if you need to transfer the oil pan and pickup tube.
• Inspect the Oil Fill Cap: Check if it reads 0W-40 or 0W-20 to prepare for the oil specification transition.
• Check for Obvious Modifications: Ensure your vehicle does not have aftermarket DFM delete kits or tuners that may conflict with a stock replacement.

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• GM PicoScope (with harness GM-60539 / GM-51450-SCOPE-B)
• Gen 5 LT Engine Tool Kit
• Crankshaft Protector (GM-44226-5)
• VCM Scanner / HP Tuners or GM Techline Connect (MDI 2)

Budget for these consumables at install:

• 0W-40 DexosR full synthetic oil (e.g., Mobil 1 Supercar)
• New AC Delco oil filter (PF63 or equivalent)
• Fresh Dex-Cool coolant (50/50 pre-diluted)
• New OE-spec iridium spark plugs
• Intake manifold gaskets
• Exhaust manifold gaskets
• High-pressure fuel pump gasket and single-use fuel crossover pipe
• New serpentine accessory drive belt
• Single-use Torque-to-Yield (TTY) bolts (crankshaft balancer bolt, flywheel/flexplate bolts)

What your vehicle’s computers will need after the swap:

What’s involved: Crankshaft Position (CKP) Variation Relearn (CASE Relearn) and ECU/ECM Re-marriage

A dealer-level scan tool (such as GM Techline Connect with an MDI 2 interface) or an advanced aftermarket programmer is required to perform the Crankshaft Position Relearn to prevent persistent misfire codes (P0315/P0300) and limited-power mode.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• Single-Use Torque-to-Yield (TTY) Fasteners: Crankshaft balancer bolt (GM Part #11547372) and flywheel bolts must be replaced.
• High-Pressure Fuel System Safety: Relieve fuel pressure before disconnecting. The high-pressure fuel pipe connecting the pump to the fuel rails is a single-use component; reusing it can cause fuel leaks and fires.
• Oil Cooler Line Inspection: Inspect and replace oil cooler lines if subject to the detaching TSB before dropping the engine in.
• Vacuum Pump Delete: If swapping into older platforms, note that the L87 does not have a mechanical vacuum pump.
• Grounding Locations: Ensure all engine and chassis ground straps are clean, tight, and reconnected to their original locations.

Easy to get right once you know them:

• Reusing the Crankshaft Balancer Bolt: Reusing this TTY bolt prevents correct clamping force, causing the balancer to wobble or slide off.
• Filling with 0W-20 Oil: Defaulting to the original 0W-20 spec instead of the updated 0W-40 DexosR spec voids the warranty and increases the risk of spinning a rod bearing.
• Reusing the High-Pressure Fuel Pipe: Reusing the crossover pipe leads to high-pressure fuel leaks over hot engine components.
• Skipping the Crankshaft Relearn: Skipping the CASE relearn causes immediate misfire codes (P0300) and a flashing Check Engine Light.
• Ignoring Lifter Tick: Ignoring a fast ticking sound (5+ ticks per second at warm idle) which indicates a failing lifter.
• Not Saving the Old Oil Filter: Failing to keep the old filter can result in a denied warranty claim by this listing.

Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer: