liter LS7 V8
hp per liter
(from General Motors
Press Release) SILVERADO 427 DELIVERS MAXIMUM PERFORMANCE WITH
LAS VEGAS – During the heyday of the muscle car, three digits
struck fear into the hearts of challengers who found themselves
unlucky enough to sidle up next to a Chevy wearing the badge “427.”
The badge is back on the Silverado 427 – a concept vehicle that
demonstrates a tangible extension of the new Silverado’s performance
The Silverado 427 is powered by GM Powertrain’s 7.0-liter LS7, the
same Gen IV small-block V-8 that is the center of power in the
Corvette Z06 and available as a “crate engine” package from GM
Performance Parts. Its cubic-inch displacement is 427. A six-speed
manual transmission backs the engine, providing the driver with full
control of the vehicle’s substantial capability.
“There’s hardly a more legendary – or menacing, depending on your
point of view – moniker in the world of performance than ‘427’,”
said John Cafaro, chief designer for full-size trucks. “The
Silverado 427 concept delivers on the expectation of that revered
badge with performance that equals or surpasses the original.”
More than just a pickup with a more powerful engine, the Silverado
427 is a total performance package, with a lowered suspension that
delivers racecar-like reflexes and an exterior styling package that
is simultaneously aggressive and understated.
“The regular cab, short box body style of the Silverado 427 was a
deliberate choice, because it represents the essence of elemental
performance: filling the smallest, nimblest body and chassis with
the most powerful engine,” said Cafaro. “Indeed, all elements of
this concept are simple and minimalist; it is equipped only with the
components necessary to convey its performance.”
This means a traditional rear-drive layout for the Silverado 427.
There is no all-wheel drive or electronic traction enhancers. Luxury
features also were kept to a minimum, as the vehicle’s focus was
kept squarely on performance.
Fitting the LS7 engine into the Silverado’s engine bay was
relatively simple, because it is based on the same Gen IV
small-block V-8 family as the Silverado’s regular production V-8
engines – and is available as a “crate engine” package from GM
Performance Parts. A custom-fabricated air intake system was
designed for the Silverado 427, adding not only a necessary air path
for the engine but also some underhood distinction.
The LS7 is rated at 505 horsepower and 470 lb.-ft. of torque, and is
built with lightweight reciprocating assembly components and other
design features that have their roots in the Corvette racing
program. In fact, the LS7 uses a racing-style dry sump oiling system
that ensures optimal engine oiling during all driving and cornering
maneuvers. Engineers had to make room under the Silverado’s hood for
the LS7’s external oil supply tank.
The Silverado 427’s LS7 engine is backed by a Tremec heavy-duty
six-speed manual transmission, which transfers torque to GM’s
automatic locking rear axle. It’s fitted with 3.73 gears, which
multiplies the torque of the LS7 to provide muscle car-challenging
acceleration. The six-speed transmission has a steep, 3.01:1 first
gear, which contributes to a tremendous performance at launch, while
two overdrive gears balance the Silverado 427’s performance with
fuel economy that first-generation 427 drivers could only dream of.
Complementing the drivetrain is a set of 22 x 10-inch five-spoke
aluminum wheels mounted to wide Pirelli Scorpion 305/40ZR22
performance tires, which do their best to maintain adherence to the
Tarmac as the LS7’s revs climb. The tires are the contact points for
a performance-tuned suspension that used Ground Force custom front
and rear lowering springs, front struts and rear shocks. The lowered
suspension helps the Silverado 427 corner flatter and with more
precision, while also giving the vehicle a “just right” performance
stance. A set of Baer disc brakes, with six-piston calipers and
16-inch-diameter rotors, provides the stopping force for the
Powerful design – inside and out
Complementing the Silverado 427’s performance is a thoughtfully
designed exterior that deftly incorporates high-performance styling
cues in a restrained manner, giving the truck a look that is
unmistakably aggressive yet respectful of its minimalist performance
ethic. The design incorporates numerous changes compared with
production Silverado models, including new front and rear fascias,
hood, cowl, tailgate, tonneau and body-side cladding.
Many of the design elements are subtle, such as the tight body
cladding – which incorporate polished billet side-exit exhaust
outlets – and shaved door handles. Other elements immediately draw
the eye; the most prominent of these being the dramatic hood scoop.
It was designed as a contemporary interpretation of the famous
Corvette “Stinger” hood scoop, which identified 427-powered
Corvettes of the mid-1960s. And like the original Stinger scoop, the
Silverado 427’s hood scoop is emblazoned with the “427” numbers and
a complementing accent color over the Laser Blue exterior color.
The grille, fascias and tailgate all are designed with a
performance-oriented, streamlined appearance. The doors are opened
via an ITW Active Touch.
Inside, the Silverado 427 is outfitted with Corvette seats that have
been covered with custom Soliel Keisel leather upholstery and
equipped with three-point racing-style harnesses. The perforated,
black leather seat coverings have blue inserts. Between the seats is
a custom center console that incorporates the shifter and houses a
set of billet-face instruments. Other details include a revised
instrument panel, with billet inserts and trim.