The Vortec’s cooling system
distributes equal amounts
of coolant to the cylinder case
for more efficient cooling.
An internally balanced crank-
shaft reduces stress
for enhanced durability.
An Electronic Throttle Control
system optimizes drivability
and fuel economy
1
as well as
reduces emissions.
VORTEC 5.3L V-8 VVT (LC9)
Vortec cylinder Head adVanced cooling system balanced cranksHaft electronic tHrottle control
> >
DuraMax DiESEL V-8 anD aLLiSOn® 6-SpEED autOMatic tranSMiSSiOn Sierra Heavy Duty models
are available with the Duramax Diesel 6.6L V-8 Turbo engine and the Allison 6-speed automatic
transmission. The Allison transmission’s target lifespan of up to 200,000 miles
2
is made possible
through the use of larger, heavier components than normally found in 1-ton pickups. With an
extraordinary 765 lb-ft of torque, the Duramax Diesel makes the 3500HD the most powerful
Sierra HD ever.
> >
VOrtEc EnginE tEchnOLOgy Mile after mile, our Vortec engines reassert their reputation for
stand-up performance and innovative, breakthrough engineering. This performance all starts
with a unique cylinder head design: By developing an effective airflow velocity and path,
just as a tornado twists a column of air, the Vortec cylinder head improves the air/fuel mix
for better performance and fuel efficiency. In addition, the coil-near-plug ignition produces
a reliable spark, and a stiff engine block provides superior vibration damping.
> >
LOcking rEar DiffErEntiaL Many GMC models are available with an Eaton
®
automatic locking rear
differential, designed to improve low-speed traction of your 2WD or 4WD vehicle. The differential
engages when the speed difference between the rear tires reaches approximately 100 rpm. Once
the differential engages, both rear wheels rotate at the same speed, providing more of the driveline’s
torque to the tire with better traction.
The Vortec engine’s unique
cylinder head design effectively
mixes the intake charge to
improve the air/fuel mixture for
enhanced performance.
7
1
EPA-estimated city/hwy mpg: Sierra XFE with Vortec 5.3L V-8, 15/22; Yukon with Vortec 5.3L V-8, 15/21; Yukon XL with
Vortec 5.3L V-8, 15/21.
2
Maintenance needs vary with different driving conditions.
The engines in GMC vehicles are specifically designed to provide the power and performance
needed to handle light, medium or heavy loads over the long haul. They consistently deliver the
high torque ratings needed to pull heavy loads and the horsepower needed to keep you moving
down the road with confidence and control.
traiLEring guiDE
pOwEr anD pErfOrMancE
(12 Seiten)
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