GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 engine DIY maintenance and service manual

General Information

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 is an 5328 cc (4.69 UK qt.) internal combustion reciprocating V8 engine. It has bore/stroke ratio of 96 mm × 92 mm (3.78 in × 3.62 in), and uses 9.45:1 compression. This engine was rated 310 hp (231.17 kW) at 5200 rpm and 335 lbf⋅ft (454.2 N⋅m) of torque at 4000 rpm. It was used in Chevrolet and GMC cars.

Engine Performance Rating

SAE J1349 (SAE Net)

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter	Output
Power Rating	310 hp (231.17 kW) at 5200 RPM
Torque Rating	454.2 N⋅m335 lbf⋅ft335 lbf⋅ft at 4000 RPM

Specifications

General

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 engine general specifications.
Parameter	Value
Type	Internal Combustion Reciprocating
Fuel Type	Gasoline
Cylinder Configuration	V8
Engine Displacement	325.13 in³325.13 in³5328 cc
Bore	3.78 in3.78 in96 mm
Stroke	3.62 in3.62 in92 mm
Compression Ratio	9.45:1
Firing Order	1-8-7-2-6-5-4-3

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Block, crankshaft and pistons

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 engine block, crankshaft and pistons specifications.
Parameter	Value
Block Material	Aluminum with iron cylinder sleeves
Crankshaft Material	Cast nodular iron
Piston Material	Cast alloy aluminum
Piston Pin Material	Chromium steel
Connecting Rod Material	Powdered metal

Spark Plugs and Wires

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 spark plugs and wires specifications.
Parameter	Value
Spark Plugs	25171803, 12567759
Spark Plug Gap	1.52 mm0.06 in0.06 in
Wires Resistance (nominal)	1000 ohms per foot

Engine head and valvetrain

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 engine head and valvetrain specifications.
Parameter	Value
Head Material	Cast aluminum alloy
Valvetrain Type	OHV
Valves per Cylinder	2
Camshaft Material	Billet steel one piece

Air Intake

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 air intake specifications.
Parameter	Value
Air Intake Method	Naturally Aspirated

Fuel Injection

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 fuel injection specifications.
Parameter	Value
Injection Type	Multi Point

Oil Pump

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 oil pump specifications.
Parameter	Value
Oil Pump	Gerotor type
Oil Pump Pressure	1.63 atm.24 Psi24 Psi at 4000 RPM

Water Pump

GMC gasoline V8 LS based GM small-block Generation III 325 CID (5.3 L) Vortec 5300 HO L33 water pump specifications.
Parameter	Value
Water Pump	Centrifugal vane impeller type pump

Engine Specifications

Condition	Value

expand_moreEngine mechanical general specifications


Camshaft bearing bore 1 and 5 ⌀	2.35–2.35 in2.35–2.35 in59.62–59.67 mm
Camshaft bearing bore 2 and 4 ⌀	2.33–2.33 in2.33–2.33 in59.12–59.17 mm
Camshaft bearing bore 3 ⌀	2.31–2.31 in2.31–2.31 in58.62–58.67 mm
Crankshaft main bearing bore diameter	2.751–2.752 in2.751–2.752 in69.871–69.889 mm
Crankshaft main bearing bore out-of-round	0.00024 in0.00024 in0.006 mm
Cylinder bore diameter	3.78–3.78 in3.78–3.78 in96–96.02 mm

expand_moreCylinder head deck height


Measuring from the centerline of crankshaft to the deck face	9.24–9.24 in9.24–9.24 in234.57–234.82 mm

expand_moreCylinder head deck surface flatness


Measured within a 152.4 mm (6.0 in) area	0.0043 in0.0043 in0.11 mm
Measuring the overall length of the block deck	0.0087 in0.0087 in0.22 mm


Valve lifter bore diameter	0.843–0.844 in0.843–0.844 in21.417–21.443 mm

expand_moreCamshaft


Camshaft end play	0.00098–0.012 in0.00098–0.012 in0.025–0.305 mm
Camshaft journal ⌀	2.16–2.17 in2.16–2.17 in54.99–55.04 mm
Camshaft journal out-of-round	0.00098 in0.00098 in0.025 mm

expand_moreCamshaft lobe lift


Exhaust	0.28 in0.28 in7.2 mm
Intake	0.28 in0.28 in7.2 mm

expand_moreCamshaft runout


Measured at the intermediate journals	0.002 in0.002 in0.05 mm

expand_moreConnecting rod

expand_moreConnecting rod bearing clearance


Production	0.00091–0.0026 in0.00091–0.0026 in0.023–0.065 mm
Service	0.00091–0.003 in0.00091–0.003 in0.023–0.076 mm

expand_moreConnecting rod bore diameter


Bearing end	2.225–2.225 in2.225–2.225 in56.505–56.525 mm

expand_moreConnecting rod bore out-of-round

expand_moreBearing end


Production	0.00016–0.00031 in0.00016–0.00031 in0.004–0.008 mm
Service	0.00016–0.00031 in0.00016–0.00031 in0.004–0.008 mm


Connecting rod side clearance	0.0043–0.02 in0.0043–0.02 in0.11–0.51 mm

expand_moreCrankshaft

expand_moreConnecting rod journal diameter


Production	2.099–2.1 in2.099–2.1 in53.318–53.338 mm
Service	2.099 in2.099 in53.308 mm

expand_moreConnecting rod journal out-of-round


Production	0.0002 in0.0002 in0.005 mm
Service	0.00039 in0.00039 in0.01 mm

expand_moreConnecting rod journal taper

expand_moreMaximum for 1/2 of journal length


Production	0.0002 in0.0002 in0.005 mm
Service	0.00079 in0.00079 in0.02 mm


Crankshaft end play	0.0016–0.0079 in0.0016–0.0079 in0.04–0.2 mm

expand_moreCrankshaft main bearing clearance


Production	0.00079–0.002 in0.00079–0.002 in0.02–0.052 mm
Service	0.00079–0.0026 in0.00079–0.0026 in0.02–0.065 mm

expand_moreCrankshaft main journal diameter


Production	2.559–2.559 in2.559–2.559 in64.992–65.008 mm
Service	2.559 in2.559 in64.992 mm

expand_moreCrankshaft main journal out-of-round


Production	0.00012 in0.00012 in0.003 mm
Service	0.00031 in0.00031 in0.008 mm

expand_moreCrankshaft main journal taper


Production	0.00039 in0.00039 in0.01 mm
Service	0.00079 in0.00079 in0.02 mm


Crankshaft rear flange runout	0.002 in0.002 in0.05 mm

expand_moreCrankshaft reluctor ring runout


Measured 1.0 mm (0.04 in) below tooth diameter	0.028 in0.028 in0.7 mm

expand_moreCrankshaft thrust surface


Production	1.03–1.03 in1.03–1.03 in26.14–26.22 mm
Service	1.03 in1.03 in26.22 mm


Crankshaft thrust surface runout	0.00098 in0.00098 in0.025 mm

expand_moreCylinder head

expand_moreCylinder head thickness


Measured from the cylinder head deck to the valve rocker arm cover seal surface	4.73 in4.73 in120.2 mm

expand_moreSurface flatness

expand_moreBlock deck


Measured within a 152.4 mm (6.0 in) area	0.0031 in0.0031 in0.08 mm
Measuring the overall length of the cylinder head	0.0039 in0.0039 in0.1 mm


Exhaust manifold deck	0.0051 in0.0051 in0.13 mm
Intake manifold deck	0.0031 in0.0031 in0.08 mm

expand_moreValve guide installed height


Measured from the spring seat surface to the top of the guide	0.68 in0.68 in17.32 mm

expand_moreIntake manifold

expand_moreSurface flatness


Measured at gasket sealing surfaces and measured within a 200 mm (7.87 in) area that includes 2 runner port openings	0.012 in0.012 in0.3 mm

expand_moreOil pan

expand_moreFront cover alignment

expand_moreAt the oil pan

expand_moreRear housing alignment

expand_moreAt the oil pan

expand_moreOil pan alignment

expand_moreTo rear of the engine block at the transmission bell housing mounting surface

expand_morePiston rings

expand_morePiston ring end gap

expand_moreFirst compression ring

expand_moreMeasured in cylinder bore


Production	0.0091–0.017 in0.0091–0.017 in0.23–0.44 mm
Service	0.0091–0.02 in0.0091–0.02 in0.23–0.5 mm

expand_moreSecond compression ring

expand_moreMeasured in cylinder bore


Production	0.017–0.028 in0.017–0.028 in0.44–0.7 mm
Service	0.017–0.03 in0.017–0.03 in0.44–0.76 mm

expand_moreOil control ring

expand_moreMeasured in cylinder bore


Production	0.0071–0.03 in0.0071–0.03 in0.18–0.75 mm
Service	0.0071–0.032 in0.0071–0.032 in0.18–0.81 mm

expand_morePiston ring to groove clearance

expand_moreFirst compression ring


Production	0.0016–0.0033 in0.0016–0.0033 in0.04–0.085 mm
Service	0.0016–0.0033 in0.0016–0.0033 in0.04–0.085 mm

expand_moreSecond compression ring


Production	0.0016–0.0031 in0.0016–0.0031 in0.04–0.078 mm
Service	0.0016–0.0031 in0.0016–0.0031 in0.04–0.078 mm

expand_moreOil control ring


Production	0.00047–0.0079 in0.00047–0.0079 in0.012–0.2 mm
Service	0.00047–0.0079 in0.00047–0.0079 in0.012–0.2 mm

expand_morePistons and pins

expand_morePin

expand_morePiston pin clearance to piston pin bore


Production	0.000079–0.00039 in0.000079–0.00039 in0.002–0.01 mm
Service	0.000079–0.00059 in0.000079–0.00059 in0.002–0.015 mm


Piston pin diameter	0.943–0.943 in0.943–0.943 in23.952–23.955 mm

expand_morePiston pin fit in connecting rod bore


Production	0.00028–0.00079 in0.00028–0.00079 in0.007–0.02 mm
Service	0.00028–0.00087 in0.00028–0.00087 in0.007–0.022 mm

expand_morePiston

expand_morePiston diameter


Measured over skirt coating	3.78–3.781 in3.78–3.781 in96.002–96.036 mm

expand_morePiston to bore clearance


Production	−0.0014–+0.00063 in−0.0014–+0.00063 in−0.036–+0.016 mm
Service limit with skirt coating worn off	0.0028 in0.0028 in0.071 mm

expand_moreValve system

expand_moreValves


Valve face angle	45°45°45°
Valve face width	0.049 in0.049 in1.25 mm
Valve lash	Net Lash - No Adjustment

expand_moreValve lift


Intake	0.48 in0.48 in12.24 mm
Exhaust	0.48 in0.48 in12.24 mm


Valve seat angle	46°46°46°
Valve seat run-out	0.002 in0.002 in0.05 mm

expand_moreValve seat width


Exhaust	0.07 in0.07 in1.78 mm

expand_moreSeat width


Intake	0.04 in0.04 in1.02 mm

expand_moreValve stem diameter


Production	0.313–0.314 in0.313–0.314 in7.955–7.976 mm
Service	0.31 in0.31 in7.95 mm

expand_moreValve stem-to-guide clearance

expand_moreProduction


Intake	0.00098–0.0026 in0.00098–0.0026 in0.025–0.066 mm
Exhaust	0.00098–0.0026 in0.00098–0.0026 in0.025–0.066 mm

expand_moreService


Intake	0.0037 in0.0037 in0.093 mm
Exhaust	0.0037 in0.0037 in0.093 mm

expand_moreRocker arms


Valve rocker arm ratio	1.70:1

expand_moreValve springs


Valve spring free length	2.08 in2.08 in52.9 mm
Valve spring installed height	1.8 in1.8 in45.75 mm

expand_moreValve spring load


Closed	340 N340 N340 N
at 45.75 mm
Open	980 N980 N980 N
at 33.55 mm