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Air Induction
A foam or paper element, low restriction air filter/cleaner should be used to protect the engine from excessive wear. Additionally, your engine control
system may have recommendations for air cleaners and intake systems for best performance.
Fuel Pump
The LS376/480, LS376/525 engine does not include a fuel pump. Generally, the EFI system requirement is 60 psi constant pressure, but consult the
information with your engine control system for the actual recommendation. The fuel pump you choose must be capable of 45 gallons per hour (GPH)
@ the recommended pressure. Chevrolet Part Number 19330301 is an in-tank unit that meets these requirements but may not be adaptable for all
applications. Numerous aftermarket pumps will meet these requirements as well.
Accessory Drive Brackets
Accessory Drive Kits 19418440, 19370820 and 19418442 with air conditioning or 19370821 or 19418441 without air conditioning are available from
Chevrolet Performance to fit the LS3 engines. These kit contain all components and hardware necessary for installation (includes air conditioning
compressor, power steering pump, and alternator). Please see your Chevrolet Performance dealer or visit us on the web at
www.chevroletperformance.com
Exhaust Manifolds
The LS376-480 and LS376-525 crate engines do not include any exhaust manifolds. Production style exhaust manifolds, P/N 12611638 and 12611639,
along with gasket P/N, 12617944 (qty 2), and bolt P/N 11518860 (qty 12) are available from your Chevrolet Performance Parts dealer. These manifolds
include the production style heat shielding.
Start-up and Break-in Procedures:
Safety first, if the vehicle is on the ground, be sure the park brake is set, the wheels are chocked, and the car cannot fall into gear. Verify everything
is installed properly and nothing was missed.
1. This engine assembly is shipped without oil and must be filled with Mobil One 5W-30. After installing the engine, ensure the crankcase has been
filled by verifying the level on the dipstick. Fill and verify all other necessary fluids such as coolant, power steering fluid, transmission oil, etc.
2. The engine should be primed with oil before starting. Install an oil pressure gauge (the existing oil pressure sensor location at the upper rear of the
engine may be used) and disconnect the engine control system (removing power from the engine control module is generally recommended but check
your engine control system information for additional details). Note: Disconnecting only ignition or fuel injector connectors is not recommended –
make sure the control system will not provide ignition or fuel to the engine. Removal of the spark plugs will allow the engine to spin faster and build oil
pressure faster.
3. Once the engine control system has been disconnected, crank the engine using the starter for 10 seconds and check for oil pressure. If no pressure is
indicated, wait 30 seconds and crank again for 10 seconds.
4. Repeat this process until oil pressure is indicated on the gauge.
5. Reconnect the engine control system. Start the engine and listen for any unusual noises. If no unusual noises are noted, run the engine at
approximately 1000 RPM until normal operating temperature is reached.
6. When possible, you should always allow the engine to warm up prior to driving. It is a good practice to allow the oil sump and water temperature to
reach 180°F before towing heavy loads or performing hard acceleration runs.
7. The engine should be driven at varying loads and conditions for the first 30 miles or one hour without wide open throttle (WOT) or sustained high
RPM accelerations.
8. Run five or six medium throttle (50%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear.
9. Run two or three hard throttle (WOT 100%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear.
10. Change the oil and filter. Replace the oil per the specification in step 1 and replace the filter with a new PF48 AC Delco oil filter.
Inspect the oil and the oil filter for any foreign particles to ensure that the engine is functioning properly.
LS376/480 and LS376/525 EFI Crate Engines
ALL INFORMATION WITHIN ABOVE
Date
BORDER TO BE PRINTED EXACTLY
19FE20
AS SHOWN ON 8.5 x 11 WHITE 16
POUND NON-BOND RECYCLABLE
19MR20
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
UNITIZED IN ACCORDANCE WITH
GMCCA SPECIFICATIONS.
.
Revision
Init Rel – Blake Nye
Revision – Blake Nye
PART No.
REV 19MR20
Auth
DR
Title
NA
NA
LS376/480 and LS376/525 EFI Crate Engines
PART No.
19419890
Installation Instructions
19419890
SHEET
3 of 12
SHEET 3 of 12
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