Page 345 of 383

6-76 Engine Specifications
Type5.7L V8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
VIN Engine Code
LS1 G. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
LS6 S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Displacement346 cubic inches (5665 cc) . . . . . . . . . 
Fuel DeliverySequential Multi
-Port . . . . . . . . . . . . . 
 Fuel Injection (SFI)
Valve ArrangementOverhead Valve . . . . . . . . . . . . . 
Piston Displacement5.7L . . . . . . . . . . . . . . . . . . . . . . 
Bore3.90 inches (9.9 cm) . . . . . . . . . . . . . . . . . . . . . . 
Stroke3.62 inches (9.2 cm) . . . . . . . . . . . . . . . . . . . . 
Compression Ratio
LS1 10.0:1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
LS6 10.5:1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Horsepower
LS1 350@5600 rpm. . . . . . . . . . . . . . . . . . . . . . . . . 
LS6 380@6000 rpm. . . . . . . . . . . . . . . . . . . . . . . . . 
Torque
LS1 (Automatic Transmission) 360@4000 rpm. . . . 
LS1 (Manual Transmission) 370@4400 rpm. . . . . . 
LS6 380@4800 rpm. . . . . . . . . . . . . . . . . . . . . . . . . 
Firing Order1
-8-7-2-6-5-4-3 . . . . . . . . . . . . . . . . . . 
Thermostat Starts to Open187F (86C) . . . . . . . . 
Normal Maintenance 
Replacement Parts
Engine Air Cleaner/FilterA917C* . . . . . . . . . . . . . . 
Battery75P
-7YR* . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Coolant Surge Tank CapGM Part No. 10296465 . . . 
15 psi (105 kPa)
Engine Oil FilterPF44* . . . . . . . . . . . . . . . . . . . . . . . 
PCV ValveCV948C* . . . . . . . . . . . . . . . . . . . . . . . . . 
0.060 inch (1.524 mm)
Spark PlugPTJ16R15 (0.060 inch Gap) . . . . . . . . . . 
Denso Type Number
Windshield Wiper Blade
Length 22 inches (55.9 cm). . . . . . . . . . . . . . . . . . . . 
Type 9 mm x 3 mm Shepherd's Hook. . . . . . . . . . . . 
* ACDelco
 part number. 
     
        
        Page 358 of 383
Scheduled Maintenance
7-12
100,000 Miles (166 000 km) (Continued)
Change automatic transmission fluid and filter if the vehicle is mainly driven
under one or more of these conditions:
± In heavy city traffic where the outside temperature regularly 
reaches 90F (32C) or higher.
± In hilly or mountainous terrain.
± Uses such as high performance operation.
Manual transmission fluid doesn't require change.
If you haven't used your vehicle under severe conditions listed previously and,
therefore, haven't changed your automatic transmission fluid, change both the
fluid and filter. Manual transmission fluid doesn't require change.
150,000 Miles (240 000 km)
Drain, flush and refill the cooling system (or every 60 months since last service,
whichever occurs first). See ªEngine Coolantº in the Index for what to use. 
An Emission Control Service. ACTUAL
SERVICED BY:MILEAGE
DATE 
     
        
        Page 359 of 383

7-13
Part B: Owner Checks and Services
Listed in this part are owner checks and services which
should be performed at the intervals specified to help
ensure the safety, dependability and emission control
performance of your vehicle.
Be sure any necessary repairs are completed at once.
Whenever any fluids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown 
in Part D.
At Each Fuel Fill
It is important for you or a service station attendant to
perform these underhood checks at each fuel fill.
Engine Oil Level Check
Check the engine oil level and add the proper oil if
necessary. See ªEngine Oilº in the Index for 
further details.
Engine Coolant Level Check
Check the engine coolant level and add DEX
-COOL
coolant mixture if necessary. See ªEngine Coolantº in
the Index for further details.Windshield Washer Fluid Level Check
Check the windshield washer fluid level in the
windshield washer tank and add the proper fluid if
necessary. See ªWindshield Washer Fluidº in the Index
for further details.
At Least Once a Month
Tire Inflation Check
Make sure tires are inflated to the correct pressures. 
See ªTiresº in the Index for further details.
Cassette Deck Service
Clean cassette deck. Cleaning should be done every
50 hours of tape play. See ªAudio Systemsº in the 
Index for further details.
Power Antenna Service
Clean power antenna mast. See ªAudio Systemsº in the
Index for further details. 
     
        
        Page 365 of 383

7-19
Part D: Recommended Fluids 
and Lubricants
NOTE: Fluids and lubricants identified below by 
name, part number or specification may be obtained
from your dealer.
USAGE
FLUID/LUBRICANT
Engine OilThe engine requires a special
engine oil meeting GM 
Standard GM4718M. Oils meeting
this standard may be identified as
synthetic, and should also be
identified with the American
Petroleum Institute Certified for
Gasoline Engines starburst
symbol. However, not all synthetic
API oils with the starburst symbol
will meet this GM standard. 
You should look for and use 
only an oil that meets GM
Standard GM4718M. For the
proper viscosity, see ªEngine Oilº
in the Index.
USAGEFLUID/LUBRICANT
Engine Coolant50/50 mixture of clean, drinkable
water and use only GM
Goodwrench
 DEX-COOL or
Havoline DEX-COOL
Coolant. See ªEngine Coolantº in
the Index.
Hydraulic 
Brake SystemDelco Supreme 11 Brake Fluid
(GM Part No. 12377967 or
equivalent DOT
-3 brake fluid).
Windshield
Washer SolventGM Optikleen Washer 
Solvent (GM Part No. 1051515) 
or equivalent.
Hydraulic 
Clutch SystemHydraulic Clutch Fluid 
(GM Part No. 12345347 or
equivalent DOT
-3 brake fluid).
Power 
Steering SystemGM Power Steering Fluid 
(GM Part No. 1052884 
- 1 pint,
1050017 
- 1 quart, or equivalent).