GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003)

GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) is an 262 in³ (4.29 L) internal combustion reciprocating V6 engine. It has bore/stroke ratio of 4.012 in × 3.48 in (10.19 cm × 8.84 cm), and uses 9.2:1 compression. This engine was rated 200 hp (149.14 kW) at 4600 rpm and 260 lbf⋅ft (352.51 N⋅m) of torque at 2800 rpm. It was used in Chevrolet and GMC cars.

GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter Output
Power Rating 200 hp (149.14 kW) at 4600 RPM
Torque Rating 260 lbf⋅ft at 2800 RPM
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) engine general specifications.
Parameter Value
Type Internal Combustion Reciprocating
Fuel Type Gasoline or Natural Gas (CNG)
Cylinder Configuration V6
Engine Displacement 262 in³
Bore 4.012 in
Stroke 3.48 in
Compression Ratio 9.2:1
Firing Order 1-6-5-4-3-2

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GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) engine block, crankshaft and pistons specifications.
Parameter Value
Block Material Cast iron
Crankshaft Material Cast nodular iron
Piston Material Cast alloy aluminum
Connecting Rod Material Forged steel
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) spark plugs and wires specifications.
Parameter Value
Spark Plugs R41-932
Spark Plug Gap 0.06 in
Wires Resistance (nominal) 1000 ohms per foot
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) engine head and valvetrain specifications.
Parameter Value
Head Material Cast iron
Valvetrain Type OHV
Valves per Cylinder 2
Camshaft Material Steel
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) air intake specifications.
Parameter Value
Air Intake Method Naturally Aspirated
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) fuel injection specifications.
Parameter Value
Injection Type Multi Point
Injection Info Direct composite distributor,
platinum-tipped spark plugs, lowresistan­
ce spark plug wires
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) oil pump specifications.
Parameter Value
Oil Pump Pressure 24 Psi at 4000 RPM
GMC gasoline V6 90° Generation I 4.3L (262 CID) Vortec 4300 V6 LU3 (2002–2003) water pump specifications.
Parameter Value
Water Pump Centrifugal vane impeller type pump
Condition Value
expand_moreGeneral specifications
expand_moreBalance shaft
Rear bearing journal clearance 0.0020.0035 in
Rear bearing journal diameter 1.4991.5 in
expand_moreCamshaft
End Play 0.0010.009 in
Journal diameter 1.871.87 in
Journal diameter out-of-round 0.00098 in
Max
expand_moreLobe lift
Exhaust 0.280.29 in
Intake 0.270.28 in
Runout 0.0026 in
expand_moreConnecting rod
expand_moreConnecting rod bearing clearance
Production 0.00150.0031 in
Service 0.000980.0025 in
Connecting rod journal diameter 2.2492.25 in
expand_moreConnecting rod journal out-of-round
Production 0.00028 in
Max
Service 0.00098 in
Max
expand_moreConnecting rod journal taper
Production 0.0002 in
Max
Service 0.00098 in
Max
Connecting rod side clearance 0.00590.017 in
expand_moreCrankshaft
expand_moreCrankshaft bearing clearance
expand_moreJournal 1
Production 0.000790.02 in
Service 0.0010.002 in
expand_moreJournal 2, 3, and 4
Production 0.00110.0023 in
Service 0.000980.0025 in
Crankshaft end play 0.0020.0079 in
expand_moreCrankshaft journal diameter
Journal 1 2.4492.449 in
Journal 2 and 3 2.4482.449 in
Journal 4 2.4482.449 in
expand_moreCrankshaft journal out-of-round
Production 0.0002 in
Max
Service 0.00098 in
Max
expand_moreCrankshaft journal taper
Production 0.00028 in
Max
Crankshaft runout 0.00098 in
Max
expand_moreCylinder bore
Diameter 4.0014.002 in
expand_moreOut-of-round
Production 0.0005 in
Max
Service 0.002 in
Max
expand_moreTaper
Service 0.00098 in
Max
expand_moreProduction
Relief Side 0.00098 in
Max
Thrust side 0.00047 in
Max
expand_moreCylinder head
Surface flatness 0.0039 in
Max
expand_moreExhaust manifold
expand_moreSurface flatness
Flange to flange 0.0098 in
Max
Individual flange 0.002 in
Max
expand_moreIntake manifold
Surface flatness 0.0039 in
Max
expand_moreOil pan
Oil pan alignment at the rear of the engine block 0.012 in
Max
expand_morePiston
expand_morePiston bore clearance
Production 0.000710.0024 in
Service 0.003 in
Max
expand_morePiston pin
expand_moreClearance in piston
Production 0.000510.00091 in
Service 0.00098 in
Max
Diameter 0.9270.927 in
Fit in connecting rod 0.000470.0019 in
Interference
expand_morePiston rings (end gap measured in cylinder bore)
expand_morePiston compression ring gap
expand_moreTop Groove
Production 0.00980.016 in
Service 0.00980.02 in
expand_moreSecond groove
Production 0.0150.023 in
Service 0.0150.031 in
expand_morePiston compression ring groove clearance
expand_moreProduction
Top Groove 0.00120.0028 in
Second groove 0.00160.0031 in
Service 0.00120.0033 in
expand_morePiston oil ring gap
Production 0.00980.03 in
Service 0.00020.0035 in
expand_morePiston oil ring groove clearance
Production 0.00180.0077 in
Service 0.00180.0079 in
expand_moreValve system
Valve face angle 45°
Valve head edge margin 0.031 in
Min
Valve lash Net Lash-No Adjustment
expand_moreValve lift
Exhaust 0.428 in
Intake 0.414 in
Valve lifter Hydraulic Roller Type
Valve rocker arm Roller Pivot Type
Valve rocker arm ratio 1.5:1
Valve seat angle 46°
Valve seat run-out 0.002 in
Max
expand_moreValve seat width
Exhaust 0.0650.098 in
Intake 0.040.065 in
Valve spring free length 2.02 in
expand_moreValve spring installed height
Exhaust 1.691.71 in
Intake 1.691.71 in
expand_moreValve spring pressure
Closed 1.111.23 ft
Open 2.732.96 ft
expand_moreValve stem clearance
expand_moreIntake
Production 0.000980.0027 in
Service 0.000980.0037 in
expand_moreExhaust
Production 0.000980.0027 in
Service 0.000980.0037 in
expand_moreValve stem oil seal installed height
Measured from the top of the large diameter valve guide bevel to the bottom of the valve stem oil seal 0.0390.079 in
expand_moreElectric engine
expand_moreBattery
expand_moreBase
Cold Cranking Amperage (CCA) 600 A
Reserve capacity rating 115 Minutes
Replacement Battery Number 78-6YR
expand_moreDual (optional)
Reserve capacity rating 115 Minutes
Replacement Battery Number 78-7YR
Cold Cranking Amperage (CCA) 770 A
Starter motor PG-260G
expand_moreGenerator
expand_moreBase
Generator model Delphi AD230
Rated Output 102 A
Load test output 71 A
expand_moreOptional
expand_moreDual
Generator model Delphi AD244
Rated Output 130 A
Load test output 91 A
expand_moreBosch Generator
Generator model Bosch 15755900
Rated Output 130 A
Load test output 91 A
Condition Value
expand_moreGeneral specifications
Accelerator cable bracket nuts for stud screws 8.85 lbf⋅ft
Accelerator cable bracket nut on throttle body 6.64 lbf⋅ft
Accelerator cable bracket stud bolts on intake manifold 4.43 lbf⋅ft
Accelerator cable bracket stud bolts on throttle body 8.85 lbf⋅ft
expand_moreBalance shaft driven gear screws
First stage 14.75 lbf⋅ft
Final stage 35°
Balance shaft retainer screws 8.85 lbf⋅ft
Battery wiring harness bracket bolt on the oil pan 8.85 lbf⋅ft
Battery negative wiring harness bolt on the engine block 18.44 lbf⋅ft
Battery positive wiring harness junction block bracket screws 18.44 lbf⋅ft
Camshaft retainer screws 8.85 lbf⋅ft
Camshaft sprocket screws 18.44 lbf⋅ft
Crankshaft balancer screws 70.07 lbf⋅ft
Crankshaft pulley screws 42.78 lbf⋅ft
Crankshaft rear oil seal housing bolt and nuts 8.85 lbf⋅ft
expand_moreCylinder head screws
expand_morePreferred method
First pass (all screws) 22.13 lbf⋅ft
Long bolts final pass in sequence 75°
Medium bolts final pass (in sequence) 65°
Short Bolts Final Pass in Sequence 55°
Drive belt idler screws 36.88 lbf⋅ft
Drive belt tensioner screws 36.88 lbf⋅ft
EGR valve inlet pipe clamp screws 18.44 lbf⋅ft
EGR valve inlet pipe nut at the intake manifold 18.44 lbf⋅ft
EGR valve inlet pipe nut at the exhaust manifold 22.13 lbf⋅ft
Engine coolant temperature sensor (ECT) 14.75 lbf⋅ft
Engine flywheel screws 73.76 lbf⋅ft
Engine front cover screws 8.85 lbf⋅ft
Engine lift bracket screws 11.06 lbf⋅ft
Use Special Tool J 41427
Engine mount bracket screws 36.88 lbf⋅ft
Engine mount bracket screws to the engine block 36.88 lbf⋅ft
Engine mount bracket through-screws 55.32 lbf⋅ft
Engine mount frame lateral screws 47.94 lbf⋅ft
Engine oil level sensor 9.59 lbf⋅ft
Junction block bracket screws 6.64 lbf⋅ft
Engine wiring harness bracket bolt on the generator and the tensioner bracket 18.44 lbf⋅ft
Engine wiring harness bracket bolt on the rear right side of the cylinder head 18.44 lbf⋅ft
Engine wiring harness bracket nut on the evaporator canister purge solenoid valve 6.64 lbf⋅ft
Engine wiring harness bracket nut on the intake manifold 8.85 lbf⋅ft
Frame cross bar screws 73.76 lbf⋅ft
Generator and belt tensioner bracket screw on the engine block 30.24 lbf⋅ft
Generator and belt tensioner bracket stud screws on the engine block 14.75 lbf⋅ft
Generator and belt tensioner bracket stud screws 30.24 lbf⋅ft
Ground wire bolt on the left rear side of the cylinder head 11.8 lbf⋅ft
Ground wire nut on the right rear side of the cylinder head 11.8 lbf⋅ft
Heater hose bracket bolt on the generator 18.44 lbf⋅ft
expand_moreLower intake manifold screws
First stage (in sequence) 2.21 lbf⋅ft
Second stage (in sequence) 8.85 lbf⋅ft
Final stage 11.06 lbf⋅ft
Oil cooler pipe bracket to the oil pan screws 8.85 lbf⋅ft
Oil filter fitting 40.57 lbf⋅ft
Oil level indicator tube screws 8.85 lbf⋅ft
Oil pan screws and nuts 18.44 lbf⋅ft
Oil pan drain plug 18.44 lbf⋅ft
Oil pan skid plate screws 14.75 lbf⋅ft
Oil pump bolt to the rear crankshaft bearing cap 66.38 lbf⋅ft
Power steering pump bracket bolt to engine 30.24 lbf⋅ft
Power steering pump bracket stud bolts to engine 14.75 lbf⋅ft
Power steering pump bracket stud bolt nuts 30.24 lbf⋅ft
Power steering pump screws 36.88 lbf⋅ft
expand_morePower steering pump nut to engine
Rear bracket to engine 30.24 lbf⋅ft
Power steering pump rear bracket nuts 36.88 lbf⋅ft
Secondary air injection (AIR) check valve pipe bracket bolt to exhaust manifold 7.38 lbf⋅ft
Secondary air injection (AIR) check valve pipe stud bolt nuts 18.44 lbf⋅ft
expand_moreSpark Plug
Initial installation new cylinder head 22.13 lbf⋅ft
All subsequent installations 11.06 lbf⋅ft
Spark plug wire support screws 8.85 lbf⋅ft
Starter wiring harness transmission cooler pipe bracket to oil pan screws 6.64 lbf⋅ft
Transmission to oil pan screws 34.67 lbf⋅ft
Transmission cover screws 8.85 lbf⋅ft
expand_moreUpper intake manifold stud screws
First stage 3.69 lbf⋅ft
Final stage 6.64 lbf⋅ft
Valve lifter push rod guide screws 11.8 lbf⋅ft
Valve rocker arm screws 22.13 lbf⋅ft
Valve rocker arm cover screws 8.85 lbf⋅ft
expand_moreEngine cooling
Air cleaner outlet ducts nuts 2.21 lbf⋅ft
Coolant heater screws 1.48 lbf⋅ft
Coolant heater cord screws 5.9 lbf⋅ft
Engine block coolant drain plug 14.75 lbf⋅ft
Fan clutch screws 16.96 lbf⋅ft
Fan clutch nuts 41.3 lbf⋅ft
Fan shroud screws 6.64 lbf⋅ft
Fan and water pump pulley screws 18.44 lbf⋅ft
Radiator screws 18.44 lbf⋅ft
Surge tank screws and nuts 6.64 lbf⋅ft
Transmission control module (TCM) cover screws 6.64 lbf⋅ft
Transmission control module (TCM) electrical connector screws 5.9 lbf⋅ft
Water outlet stud screws 18.44 lbf⋅ft
Water pump screws 33.19 lbf⋅ft
expand_moreElectric engine
Auxiliary battery wiring harness bracket screws 7.38 lbf⋅ft
Auxiliary battery relay nuts 6.64 lbf⋅ft
Auxiliary positive battery wiring harness screws 12.54 lbf⋅ft
Auxiliary positive battery wiring harness nuts 5.9 lbf⋅ft
Auxiliary positive wiring harness to relay nuts 6.64 lbf⋅ft
Battery wiring harness bracket screws 18.44 lbf⋅ft
Battery wiring harness channel bracket screws 8.85 lbf⋅ft
Battery wiring harness junction block bracket screws 6.64 lbf⋅ft
Battery hold down retainer screws 18.44 lbf⋅ft
Battery tray screws 6.64 lbf⋅ft
Battery tray nuts 18.44 lbf⋅ft
Auxiliary battery ground wiring harness screws 11.8 lbf⋅ft
Engine wiring ground harness screws 11.8 lbf⋅ft
Engine wiring ground harness screws 18.44 lbf⋅ft
Front axle mounting bracket nuts 70.07 lbf⋅ft
Forward lamp wiring ground harness screws 6.64 lbf⋅ft
Front end diagonal brace screws 6.64 lbf⋅ft
Generator wiring harness nuts 6.64 lbf⋅ft
expand_moreGenerator bracket screws
Right and rear 18.44 lbf⋅ft
Left 36.88 lbf⋅ft
Generator bracket screws and nuts 30.24 lbf⋅ft
Ground strap nuts 6.64 lbf⋅ft
Heater hose bracket screws 18.44 lbf⋅ft
Negative Battery wiring harness screws 12.54 lbf⋅ft
Negative Battery wiring harness bolt on the engine block 11.8 lbf⋅ft
Negative Battery wiring harness on the frame 6.64 lbf⋅ft
Positive battery wiring harness screws 12.54 lbf⋅ft
Positive battery wiring harness bolt on the engine block 8.85 lbf⋅ft
Positive battery wiring harness to engine wiring harness junction block screws 6.64 lbf⋅ft
Positive battery wiring harness to generator nuts 13.28 lbf⋅ft
Positive battery wiring harness to starter nuts 11.8 lbf⋅ft
Positive wiring harness at underhood bussed electrical center (UBEC) screws 6.64 lbf⋅ft
Starter screws 31.72 lbf⋅ft
Starter lead nuts 6.64 lbf⋅ft
Starter solenoid nuts 2.51 lbf⋅ft
Surge tank screws and nuts 6.64 lbf⋅ft
Transmission cover screws 6.64 lbf⋅ft
Wiring harness bracket screws 18.44 lbf⋅ft
expand_moreEngine controls
Accelerator cable bracket screws 18.44 lbf⋅ft
Accelerator cable bracket nuts 8.85 lbf⋅ft
Accelerator cable bracket nuts 6.64 lbf⋅ft
Air cleaner outlet ducts nuts 1.84 lbf⋅ft
Air ducts bracket stud screws 5.9 lbf⋅ft
Camshaft position (CMP) sensor screws 1.62 lbf⋅ft
Coolant hose nipple 12.54 lbf⋅ft
Crankshaft position sensor (CKP) mounting screws 6.64 lbf⋅ft
Distributor screws 18.44 lbf⋅ft
Distributor cap screws 1.77 lbf⋅ft
Engine coolant temperature sensor (ECT) 14.75 lbf⋅ft
EGR pipe bracket screws 18.44 lbf⋅ft
EGR pipe fitting on the exhaust manifold 22.13 lbf⋅ft
EGR pipe fitting on the intake manifold 18.44 lbf⋅ft
EGR valve attaching bolts, first step 7.38 lbf⋅ft
EGR valve attaching bolts, second step 18.44 lbf⋅ft
EVAP canister bracket screws 18.44 lbf⋅ft
EVAP canister purge valve mounting nuts 8.85 lbf⋅ft
EVAP canister bracket screws 7.38 lbf⋅ft
EVAP canister ventilation valve bracket screws 8.85 lbf⋅ft
Fuel lines fittings 20.65 lbf⋅ft
Fuel filler hose clamps 18.44 lbf⋅ft
Fuel filler hose ground strap screws 6.64 lbf⋅ft
Fuel filler hose housing screws 1.7 lbf⋅ft
Fuel filler ventilation hose clamp 1.84 lbf⋅ft
Fuel filter fittings 18.44 lbf⋅ft
Fuel lines in the engine compartment 20.65 lbf⋅ft
Fuel line clip screws 4.43 lbf⋅ft
Fuel line clip nuts 18.44 lbf⋅ft
Fuel line attaching nuts 19.91 lbf⋅ft
Fuel line to fuel rail retaining screws 2.21 lbf⋅ft
Fuel return line nuts 2.21 lbf⋅ft
Fuel pressure regulator bracket 2.58 lbf⋅ft
Fuel rail attaching screws 7.38 lbf⋅ft
Fuel tank shield to frame screws 13.28 lbf⋅ft
Fuel tank strap attaching screws 29.5 lbf⋅ft
Fuel tank bracket strap 33.19 lbf⋅ft
Heated oxygen sensor 30.98 lbf⋅ft
Idle air control attaching valve screws 2.21 lbf⋅ft
Ignition coil mounting screws 8.11 lbf⋅ft
Ignition module mounting screws 2.58 lbf⋅ft
Injector retainer lock nuts 2.21 lbf⋅ft
Knock sensor 18.44 lbf⋅ft
Mass air flow (MAF) hose clamp 2.95 lbf⋅ft
Power brake fitting 9.59 lbf⋅ft
Powertrain control module (PCM) end connector 5.9 lbf⋅ft
Pressure regulator screws 7.38 lbf⋅ft
Purge solenoid mounting nuts 8.85 lbf⋅ft
Purge valve mounting bracket screws 5.9 lbf⋅ft
Rotor hold down screws 1.48 lbf⋅ft
Spark plug new aluminium head 14.75 lbf⋅ft
Spark plug new iron head 22.13 lbf⋅ft
Spark plug used head 11.06 lbf⋅ft
Steering linkage shield mounting screws 24.34 lbf⋅ft
Throttle body assembly retaining stud screws 6.64 lbf⋅ft
Throttle cable bracket screws 18.44 lbf⋅ft
Throttle position sensor (TPS) screws 1.48 lbf⋅ft
Upper manifold screws 5.9 lbf⋅ft
Upper manifold nuts 5.9 lbf⋅ft
Vacuum module attaching screws 5.9 lbf⋅ft
expand_moreExhaust system
Engine shield screws 14.75 lbf⋅ft
EGR valve inlet pipe fitting to the exhaust manifold 22.13 lbf⋅ft
EGR valve inlet pipe fitting to the intake manifold 18.44 lbf⋅ft
EGR valve pipe to the cylinder head screws 36.88 lbf⋅ft
EGR valve pipe to the exhaust manifold screws 22.13 lbf⋅ft
EGR valve pipe to the intake manifold screws 7.38 lbf⋅ft
Exhaust heat shield screws 6.64 lbf⋅ft
Exhaust heat shield nut (body panel) 6.64 lbf⋅ft
Exhaust manifold stud screws 22.13 lbf⋅ft
Exhaust manifold heat shields 6.64 lbf⋅ft
Exhaust manifold pipe bracket 0.00000047 in
Exhaust manifold pipe nuts 36.88 lbf⋅ft
Exhaust muffler clamp 22.13 lbf⋅ft
Exhaust muffler hanger nuts 36.88 lbf⋅ft
Exhaust muffler nuts 29.5 lbf⋅ft
Exhaust pipe clamp 29.5 lbf⋅ft
Hood hinge screws 18.44 lbf⋅ft
Oxygen Sensor 30.98 lbf⋅ft
Rear shock absorber lower screws 70.07 lbf⋅ft
Spark plug wire retainer screws 8.85 lbf⋅ft
Transmission screws 73.76 lbf⋅ft
Units:
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