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L78 6.6L engine: specs, donor vehicles & swap notes

SpecValue
RPOL78
FamilyGeneration VI
Years2027- present
Displacement6.6 L / 401 ci
Horsepower481 hp
Torque501 lb-ft
Bore × stroke4.065 × 3.858 in
CompressionNot yet published
AFM/DODNo

Specs from secondary sources; GM ratings varied by year and vehicle.

Donor vehicles with the L78

Where to find one at the junkyard. Confirm with the RPO sticker in the glovebox or the 8th VIN digit.

VehicleYears
Chevrolet Silverado/GMC Sierra 15002027–present

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