LT5 Engine Specifications

more quickly and accurately than previous systems with a single segment. The dual 58X/4X measurement ensures extremely accurate timing forthe life of the engine. Moreover, it provides an effective backup system in the event one sensor fails.Air Induction Humidity Sensor: This new feature ensures optimal combustion efficiency, regardless of the surrounding air’s humidity.Coil-on-Plug Ignition: The Gen-V’s individual coil-near-plug ignition features advanced coils that are compact and mounted on the rocker covers,although they are positioned differently than on Gen-IV engine. An individual coil for each spark plug delivers maximum voltage and consistentspark density, with no variation between cylinders.Iridium-Tip Spark Plugs: The spark plugs have an iridium electrode tip and an iridium core in the conductor, offering higher internal resistance whilemaintaining optimal spark density over its useful life. The electrode design improves combustion efficiency.Fuel SystemLow Pressure (Fuel Tank to Engine)A fuel flow rate of 75 G/H (Gallons per hour) at 72 psi (500 kPa) is recommended for optimum performance. Because this is a dead headed system,a pressure relief set at 84 psi (580 KPa) must be included in the fuel line between the tank pump and engine mounted high pressure pump.It is not recommended to use a low pressure fuel system that is not controlled by the FPPM (Fuel Pump Power Module). A pump with excessivecapacity may result in cavitation at low flow due to the pump repeatedly stopping and starting instead of controlling to a speed/pressure. If aFPPM is not used, diagnostic codes will be set in the ECM (the MIL light may not be illuminated). Excessive fuel heating and potentialstartability/drivability issues may result from a pump operating at constant high pressure. A fuel pressure relief set to 84 psi (580 kPa) should beinstalled in between the low pressure supply fuel pump and the engine mounted high pressure fuel pump.A pump with excessive capacity may result in cavitation at low flow due to the pump repeatedly stopping and starting instead of controlling to aspeed/pressure. Alternatively, a fuel system operating at a fixed 72 psi (500 kPa) could be used and fuel pump relay may be triggered by theGreen/Gray wire in cavity 2 of the Fuel Pump Power Module (FFPM) connector. The Green/Gray wire is a 12 volt positive side control for a fuelpump relay. Do not use or install the Fuel Pump Power Module if using this alternate method. Diagnostic codes will be set in the ECM if the FPPMis not used, but will not illuminate the MIL (malfunction indicator light). Note that excessive fuel heating and potential startability/driveabilityissues may result for a constant high pressure.High Pressure (On Engine)The LT5 engine is equipped with two sets of fuel injectors. The (8) DI/primary fuel system consists of 8 separate direct injection fuel injectors, twohigh pressure fuel rails, a high pressure cross-over fuel pipe (connects the two fuel rails), a high pressure fuel feed pipe (connects the cross-overpipe to the high pressure fuel pump), a high pressure fuel pump and a low pressure fuel feed pipe. The injectors are each seated into theirindividual bores in the cylinder heads with two combustion seals to provide sealing. The high pressure fuel pump mounts to the rear of the EngineBlock Valley Cover in the engine valley. Motion is transmitted to the pump from a tri-lobe on the rear of the camshaft through a hydraulic rollerlifter.A second set of (8) PFI/secondary fuel injectors are mounted to the Supercharger assembly. The PFI/secondary fuel injectors are present tosupplement fuel delivered to the engine when the DI/primary fuel system is not capable of providing the total engine fueling demand. ThePFI/secondary fuel injectors are only activated at high engine loads when substantial fuel enrichment is necessary for exhaust system protection orto achieve peak engine torque/power.The high fuel pressure necessary for direct injection is supplied by the high pressure fuel pump. The high pressure fuel pump is mounted on therear of the engine under the intake supercharger manifold and is driven by a three-lobe cam on the camshaft. This high pressure fuel pump alsoregulates the fuel pressure using an actuator in the form of an internal solenoid-controlled valve that is controlled by the ECM.Crankcase Ventilation System Description (LT5)A positive crankcase ventilation (PCV) system is used in order to provide a more complete scavenging of crankcase vapors. Filtered air from the airinduction system duct is supplied to the crankcase, mixed with blow-by vapors, and passes through a crankcase ventilation metering device beforeentering the supercharger. The primary component in the positive crankcase ventilation (PCV) system is the PCV flow metering device (valve ororifice). Vacuum changes within the supercharger result in flow variations of the blow-by vapors. If abnormal operating conditions occur, thedesign of the PCV system permits excessive amounts of blow-by vapors to back flow through the crankcase vent tube and into the engine inductionsystem to be consumed during normal combustion. This engine ventilation system design minimizes oil consumption and significantly reduces thepotential for oil ingestion during vehicle limit handling maneuvers. There are two clean air supply locations for PCV. One on the right side valvecover and one on the left side valve cover.LT5 Dry Sump Engine InstallationALL INFORMATION WITHIN ABOVE BORDERTO BE PRINTED EXACTLY AS SHOWN ON 8.5x 11 WHITE 16 POUND NON-BONDRECYCLABLE PAPER. PRINT ON BOTH SIDES,EXCLUDING TEMPLATES. TO BE UNITIZED INACCORDANCE WITH GMCCASPECIFICATIONS.Date18JA1903MR22RevisionInit Rel – Alin DragoiuRevision – Blake NyePART No.REV 03MR22 19417106AuthNANADRTitleSHEET3 of 28Installation InstructionsLT5 Dry Sump Engine InstallationPART No.19417106SHEET 3 of 28

The LT5 engine utilizes an integral positive crankcase ventilation system which is located in theEngine Block Valley Cover beneath the Supercharger Assembly. The Engine Block Valley Covercontains composite oil separating baffles and PCV plumbing. Filtered fresh air is routed fromupstream of the throttle plate to the engine oil tank where it mixes with crankcase gasses and ispassed to both engine rocker arm covers. The rocker arm covers’ design shields rocker arm oilspray, thereby reducing the potential for oil being drawn back into the tank during backflow of theventilation system. Blow-by vapors are routed from the Engine Block Valley Cover through a fixedorifice 7.5 mm (0.295 in) within a steel PCV tube, then into the underside of the supercharger nearthe front of the engine block valley cover.Filtered Air InletPCV hose 12680699 can be purchased to obtain the quick connect fitting, when creating a custominstallation.Vacuum PortThis port needs to be capped or can be used to supply vacuum to the brake booster.Pipe assembly 84492718 can be purchased to obtain the quick connect fitting for custom builds.PVC HoseVacuum PortVariable Camshaft TimingThis engine has the ability to vary the camshaft position versus the piston position. If you chose to use the Chevrolet Performance engine controllerkit, then it will vary camshaft timing to improve emission and fuel economy, while still producing great power. At idle, for example, the cam is atthe full advanced position, allowing exceptionally smooth idling. Under other conditions, the phaser adjusts to deliver optimal valve timing forperformance, drivability and fuel economy. At high rpm it may retard timing to maximize airflow through the engine and increase horsepower. Atlow rpm it can advance timing to increase torque. Under a light load, it can retard timing at all engine speeds to improve fuel economy. A vane-typephaser is installed on the front of the camshaft to change its angular orientation relative to the sprocket, thereby adjusting the timing of valveoperation on the fly. It is a dual-equal cam phasing system that adjusts camshaft timing at the same rate for both intake and exhaust valves. Thesystem allows linear delivery of torque, with near-peak levels over a broad rpm range, and high specific output (horsepower per liter ofdisplacement) without sacrificing overall engine response, or drivability. It also provides another effective tool for controlling exhaust emissions.Intake Manifold/Supercharger AssemblyThe LT5 Roots-type supercharger is a positive displacement pump that consists of 2 counter-rotating rotors installed into the lower intake manifoldhousing. The rotors are designed with 4 lobes and a helical twist. The rotors of the supercharger are designed to run at a minimal clearance, not incontact with each other or the housing and are timed to each other by a pair of precision spur gears which are pressed onto the rotor shafts. Therotors are supported at each end by self-lubricating non-serviceable bearings. The drive belt pulley is pressed onto the input shaft. The input shaftis coupled to the rotor shaft. Both the belt pulley and shaft coupling are also non-serviceable.The upper intake manifold housing has an integrated intercooler system. Cooling the air enhances the effectiveness of the supercharger. Theintercooler uses conventional coolant in a separate system from the engine cooling system. The intercooler system includes two charge aircoolers/heat exchangers, a water manifold assembly, and a variety of sensors to monitor air temperature and pressure. The water manifold,located at the front of cover transfers coolant to the cover via four internal transfer tubes. The transfer tubes and water manifold are sealed withO-rings and press-in-place seals. Coolant enters the inlet port of the water manifold assembly, is directed into and through the two charge airLT5 Dry Sump Engine InstallationALL INFORMATION WITHIN ABOVE BORDERTO BE PRINTED EXACTLY AS SHOWN ON 8.5x 11 WHITE 16 POUND NON-BONDRECYCLABLE PAPER. PRINT ON BOTH SIDES,EXCLUDING TEMPLATES. TO BE UNITIZED INACCORDANCE WITH GMCCASPECIFICATIONS.Date18JA1903MR22RevisionInit Rel – Alin DragoiuRevision – Blake NyePART No.REV 03MR22 19417106AuthNANADRTitleSHEET4 of 28Installation InstructionsLT5 Dry Sump Engine InstallationPART No.19417106SHEET 4 of 28

coolers/heat exchangers, and exits back into the water manifold. Coolant then exits the water manifold outlet port returning to the separatecooling system. The two charge air coolers/ heat exchangers are not serviceable.The supercharger assembly consists of the following components:·Lower Intake Manifold Housing, to include rotors, gears, bearings, shaft coupling, and drive belt pulley·Electronic compressor recirculation valve·Bypass Actuator·Throttle Body Assembly·Evaporative Emission Canister Purge Valve·Inlet Pressure Sensor·Manifold Air Pressure and Temperature Sensor·Over boost Control·Water Manifold Assembly·Charge Air Coolers/Heat Exchangers·Intake Air Temperature (IAT) Sensor·Air Outlet Pressure SensorOperationThe supercharger is designed to increase the air pressure and density in the intake manifold. When this air is mixed with the correct amount of fuelthe result is more power from the engine. The supercharger provides an intake manifold air pressure of up to 65.8 kPa (13.9 psi). The superchargeris a positive displacement pump and is directly driven from the engine drive belt system, an increase in intake manifold air pressure is available atall engine speeds.The charge air bypass valve is an electrically operated valve that is attached to the supercharger housing. The valve is controlled by the enginecontrol module (ECM). The ECM determines when pressure from the manifold is routed to the bypass actuator. The charge air bypass valve allowspressure from the manifold to open the bypass valve and lower boost pressure during specific driving conditions. The open bypass valve reducesthe pumping effort of the supercharger, thereby increasing the fuel efficiency in light load operations.Powertrain CoolingCoolant Type40/60 coolant/water mixture of clean, drinkable water and use only DEX-COOL Coolant.Engine Cooling SystemA surge tank is recommended for removing air from the engine coolant, but as long as the radiator or surge tank is the highest point in the system,then air will be evacuated from the coolant. The highest point, meaning that either the radiator or the surge tank have a portion higher than thetop of the cylinder heads. If they are not, then air can be trapped within the cylinder heads and cause portions of the cylinder heads to overheat,which will be detrimental to engine performance and longevity. Coolant is drawn from the radiator outlet and into the water pump inlet by thewater pump. Some coolant will then be pumped from the water pump, to the heater core, then back to the water pump. This provides thepassenger compartment with heat and defrost. Coolant is also pumped through the water pump outlet and into the engine block. In the engineblock, the coolant circulates through the water jackets surrounding the cylinders where it absorbs heat.The cylinder head air bleed needs to be routed to the highest point in the cooling system. This will assist in removing air from the cylinder heads.Cylinder Head Air BleedHeaterinlet/outletPump OutletPump InletHose 84214922 can be purchase to obtain the heater inlet/outlet quick connects, when creating a custom installation.LT5 Dry Sump Engine InstallationALL INFORMATION WITHIN ABOVE BORDERTO BE PRINTED EXACTLY AS SHOWN ON 8.5x 11 WHITE 16 POUND NON-BONDRECYCLABLE PAPER. PRINT ON BOTH SIDES,EXCLUDING TEMPLATES. TO BE UNITIZED INACCORDANCE WITH GMCCASPECIFICATIONS.Date18JA1903MR22RevisionInit Rel – Alin DragoiuRevision – Blake NyePART No.REV 03MR22 19417106AuthNANADRTitleSHEET5 of 28Installation InstructionsLT5 Dry Sump Engine InstallationPART No.19417106SHEET 5 of 28

Engine Oil Pump - Dry Sump OilingEngine lubrication is supplied by a two-stage oil pump assembly. The oil pump assemblyconsists of a primary vane-type variable displacement pump and a secondary geroter-stylepump. The primary pump contains a pressure relief valve that protects the oil pan mountedoil filter from over pressurization during cold engine start up. If system pressure exceeds600 kPa (87 psi), the pressure relief valve will open and exhaust oil back into the oil pan. Thefront or forward gear set is the secondary pump. The rear or rearward housing contains theprimary pump. The pump assembly is mounted at the front of the engine and driven directlyby the crankshaft sprocket. The vanes of the primary pump rotate clockwise and draw oilfrom the engine oil tank through the oil tank screen. The oil is pressurized as it passesthrough the primary pump and is sent through the engine block lower oil gallery.Oil drain plugsPressurized oil is directed through the engine block lower oil gallery to the full flow oil filterwhere harmful contaminants are removed. A bypass valve is incorporated into the oil filter,which permits oil flow in the event the filter becomes restricted.Oil exits the oil filter and is then directed to the external oil cooler. The external oil cooler isa liquid to liquid (engine coolant to oil) oil cooler and consists of an oil pan mounted coreand coolant lines that connect the oil cooler to the engine cooling circuit. A bypass valve is incorporated into the oil cooler assembly in the event oilflow within the cooler is restricted. Oil returns from the oil cooler and is directed to the upper engine main oil galleries.The LT5 Gen-V engine feature oil-spray piston cooling, in which eight oil-spraying jets in the engine block drench the underside of each piston andthe surrounding cylinder wall with an extra layer of cooling, friction-reducing oil. The oil spray reduces piston temperature, promoting extremeoutput and long-term durability. The extra layer of oil on the cylinder walls and wristpin also dampens noise originating from the pistons.The oil tank inlet port is used to supply scavenged oil from the engine to the storage tank. The oil tank outlet port is used to supply non-aerated oilfrom the storage tank to the engine. Chevrolet Performance parts oil adaptor kit part number 25534412 can be used to convert to AN-12 fittings,when using specialized reservoir tank.When replacing engine oil, there are two oil drain plugs within the oil pan. One plug drains the oil pan and the other plug drains the storage tank.Engine Oil CoolingThe engine as delivered comes with a liquid to liquid engine oil cooler. Engine oil is pumped thru the cooler and engine coolant is pumped thru thecooler, to transfer the engine oil heat into the engine coolant. The engine coolant should route to the lower portion of the radiator, or inlet hose ofthe coolant pump. Heat is then removed by the engine radiator.DESCRIPTIONPART NUMBERQUANTITYOil cooler hose (1)22768504Oil cooler hose (2)8421492411If the cooler is not used then the following parts can be used to eliminate the oilcooler.DESCRIPTIONPART NUMBERQUANTITYPlug-block coolant11611351Plate-oil transfer12630766Bolt-oil plate11562426Oil cooler hose 2Oil cooler hose 1112Coolant PlugOil transferplateOil Cooler boltsLT5 Dry Sump Engine InstallationALL INFORMATION WITHIN ABOVE BORDERTO BE PRINTED EXACTLY AS SHOWN ON 8.5x 11 WHITE 16 POUND NON-BONDRECYCLABLE PAPER. PRINT ON BOTH SIDES,EXCLUDING TEMPLATES. TO BE UNITIZED INACCORDANCE WITH GMCCASPECIFICATIONS.Date18JA1903MR22RevisionInit Rel – Alin DragoiuRevision – Blake NyePART No.REV 03MR22 19417106AuthNANADRTitleSHEET6 of 28Installation InstructionsLT5 Dry Sump Engine InstallationPART No.19417106SHEET 6 of 28

Pilot BearingYou must install a pilot bearing in the rear of the crankshaft, if the engine will be used with a manual transmission. The pilot bearing aligns thetransmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear.There are two different Chevrolet pilot bearings for the LT5, 14061685 is for a long input shaft transmission and 12557583 is for a short input shafttransmission. Verify fit prior to installing the transmission or damage will occur.Starter MotorA starter motor is not provided with the engine. The following parts are designed for the LT5 starting system.ITEM DESCRIPTIONPART NUMBERQUANTITYShield-starter motor126561321Starter motor126192411Bolt-starter motor 11610633 2 Bolt-heat shield 11588711 3Starter MotorEvaporative Emissions ValveThe evaporative emissions system can be used with the Chevrolet Performance engine controlkit, but is not required for proper engine operation. This port should be plugged or connected toa vapor canister.Heat shieldExhaust ManifoldsThe as shipped exhaust manifolds may not fit your vehicle. One option is to use the ChevroletSilverado Gen 5 small block manifolds or Chevrolet Camaro Gen 5 small block manifolds.Charge Air Cooling System (LT5)This kit contains a charge air coolant pump. The pump is controlled by the ChevroletPerformance Parts engine control system. The charge air cooling systems function is to reduce the temperature of the air charge that is heatedduring the supercharging process which improves the efficiency and performance of the powertrain. The charge air cooling system is an air-tocoolant system that uses a separate charge air cooling radiator. An electric pump is used to flow coolant from the charge air cooler (vehiclespecific), through the supercharger, then back to the charge air cooler where the cycle repeats.OIL PRIMING: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 everythingis installed properly and nothing was missed.After installing the engine, ensure the oil system has been filled. The engine will come with some oil. Due to the custom nature of a dry sump oilingsystem, it is up to the customer to determine the correct amount of oil.This crate engine requires a special oil meeting DEXOS1 - 0W40 or Mobil 1 15W50. Also, check and fill as required any other necessary fluids suchas coolant, power steering fluid, etc.Preluber instructions (Kent-More J-45299):NOTE: A constant and continuous flow of clean engine oil is required in order to properly prime the engine. Be sure to use approved engine oil,as specified.·Install an oil pressure gauge (the existing oil pressure sensor location at the upper rear of theengine may be used).·Locate and remove the engine block left rear oil gallery plug.·Install the adapter M16 x 1.5 part number 509375·Install the flexible hose to the adapter and open the valve.·Pump the handle on the J-45299 preluber in order to flow a minimum of 1-1.9 liters (1-2quarts) engine oil. Observe the flow of engine oil through the flexible hose and into theLocation for oil primingengine assembly. The engine will be primed after a small amount of pressure change is seenon the in car oil pressure gauge while pumping J-45299.·Close the valve and remove the flexible hose and adapter from the engine.·Apply approved thread sealer and Install the oil gallery plug to the engine and tighten to 60Nm (44 lb. ft.).LT5 Dry Sump Engine InstallationALL INFORMATION WITHIN ABOVE BORDERTO BE PRINTED EXACTLY AS SHOWN ON 8.5x 11 WHITE 16 POUND NON-BONDRECYCLABLE PAPER. PRINT ON BOTH SIDES,EXCLUDING TEMPLATES. TO BE UNITIZED INACCORDANCE WITH GMCCASPECIFICATIONS.Date18JA1903MR22RevisionInit Rel – Alin DragoiuRevision – Blake NyePART No.REV 03MR22 19417106AuthNANADRTitleSHEET7 of 28Installation InstructionsLT5 Dry Sump Engine InstallationPART No.19417106SHEET 7 of 28

In the absence of a preluber kit, the following process can be used.1. Install an oil pressure gauge (the existing oil pressure sensor location at the upper rear of the engine may be used).2. Disconnect fuel and the ignition control system (removing power from the ignition control module is recommended).3. Remove all of the spark plugs, which will reduce the load on the engine bearings and starter motor during the oil priming sequence.4. Once, the fuel and ignition control systems have been disconnected, place the vehicle in neutral and crank the engine using the starterfor 10 seconds and check for oil pressure. If no pressure is indicated, wait 30 seconds and crank again for 10 seconds. Repeat this processuntil oil pressure is indicated on the gauge.5. Install the spark plugs and reconnect the fuel and ignition control systems.START-UP AND BREAK-IN PROCEDURES1. Start the engine and listen for any unusual noises. If no unusual noises are noted, run the engine at approximately 1000 RPM until normaloperating temperature is reached.2. 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 watertemperature to reach 180 F before towing heavy loads or performing hard acceleration runs.3. The engine should be driven at varying loads and conditions for the first 30 miles or one hour without wide open throttle (WOT) orsustained high RPM accelerations.4. Run five or six medium throttle (50%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear.5. Run two or three hard throttle (WOT 100%) accelerations to about 4000

The LT5 crate engine require an engine control system which is available from your Chevrolet Performance Parts dealer. Check with your dealer or on www.chevroletperformance.com for the control system packages that are currently available. For information about warranty coverage, please contact your local Chevrolet Performance Parts dealer.