GM Leak Confirms 2027 Corvette Grand Sport to Feature 6.7L LS6 V8

• GM Parts Book lists 6.7L LS6 V8 for 2027 Corvette Grand Sport

• Engine features DI, PFI, OHV layout with aluminium bloc

• Forum source previously confirmed ZR1 LT7 engine specs in 2023

A newly surfaced leak from GM’s internal parts catalogue has confirmed that the upcoming 2027 Corvette Grand Sport will feature a 6.7-litre LS6 V8 engine, contrary to earlier reports suggesting a 6.6-litre displacement.

The information was shared by a known user, “JMB56,” on MidEngineCorvetteForum.com, who previously revealed accurate specifications for the Corvette ZR1’s LT7 engine in 2023. According to a screenshot from the GM Parts Book, the listing describes the LS6 as: “ENGINE GAS, 8 CYL, 6.7L, DI, PFI, OHV, ALUM, GEN 6.”

This designation confirms several technical attributes, including a gasoline-powered V8 engine with both direct injection (DI) and port fuel injection (PFI), an overhead valve (OHV) configuration, and an aluminium block construction. The engine is classified as a sixth-generation (Gen 6) small-block unit.

The leak was reportedly discovered under a listing of future regular production option (RPO) codes for the 2027 model year. According to the forum post, this marks a shift from previous leaks that were tied to future vehicle model listings, indicating GM may be adjusting how it manages confidential pre-release data.

Earlier reports suggested GM was preparing two Gen-IV V8 engines, a 6.6-litre and a 5.7-litre to be used across both Corvette and Chevrolet truck models. The new parts listing challenges that assumption, confirming the LS6 V8 will instead use a 6.7-litre configuration.

Incidentally, 6.7 litres of displacement is the equivalent of 409 cubic inches. From 1961 to 1965, Chevrolet’s big-block V8 found its way into a range of full-size models, most notably the Impala SS, but also the Bel Air, Biscayne, and even select pickup trucks. Those engines quickly became an emblem of the early muscle-car movement and were forever etched into pop culture thanks to The Beach Boys’ hit song “409.”

The GM Parts Book has been a consistent source of reliable information in the past. In 2023, the same source disclosed specifications for the C8 ZR1’s LT7 engine, which was later confirmed to be a 5.5-litre twin-turbo V8 with direct injection, variable valve timing, active fuel management, and dual overhead cams.

No official comment has been made by GM regarding the LS6 engine or its deployment in the 2027 Grand Sport. Production details and performance metrics remain unconfirmed at this time.

Source: midenginecorvetteforum