FAQ – LS2 Specifications

FAQ – LS2 Specifications

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LS2 Engine Specifications


The first of the GEN IV GM engines in the LS family, the LS2 was standard in the Pontiac G8 GT as well as the Chevy Corvette, GTO and SSR as well as other GM offerings. LS2 engines are terrific choices for engine swap candidates, and can accept LS1, LS6, LS3 and L92 cylinder heads as well as many other parts they share with the GEN III.

We’ll be taking a look at LS2 Specifications from the cylinder heads to the block, please let us know if we’ve missed any LS2 Specifications you would like to see.
Block Displacement: 6.0L (364 cid)
Block type: Cast alloy with 6-bolt cross-bolted main caps
Bore x Stroke: 4.000″ x 3.622″
Length: 20.43″
Width: 18.11″
Deck height: 9.235-9.245″ (9.240″ average)
Cylinder bore diameter: 4.0007–4.0017″
Thrust wall: center main (No. 3)
Camshaft tunnel dia: 2.168-2.169″
Block deck flatness: 0.004″ within 6″ area/0.008″ length of deck (max)
Main bore dia: 2.750¬2.751″

Camshaft bearing bore dia (1&5): 2.345–2.347″
Camshaft bearing bore dia (2&4): 2.325–2.327″
Camshaft bearing bore dia (3): 2.306¬2.308″
Lifter bore dia: 0.843–0.844″
Cylinder bore dia: 4.0007–4.0017″
Cylinder bore taper: 0.0007″ (max at thrust side)
Cylinder bank angle: 45 degrees
Cylinder bank offset: 0.949″
Bore center spacing: 4.400″
Firing Order: 1-8-7-2-6-5-4-3 (unique to LS)
Spark plugs: AC 41-931 gap: 0.040″

Crankshaft


Rotation: clockwise (viewed from front)
Runout: 0.000118″ (max/production)
Main bearing clearance: 0.0007–0.00212″
Rod pin dia: 2.0991–2.0999″
Rod pin taper: 0.0002″ (max)
Rod pin width: 1.902″
End play: 0.0015–0.0078″
Main journal dia: 2.558–2.559″
Main journal taper: 0.0004″ (max)
Main journal out-of-round: 0.000118″ max
Crankshaft runout: less than 0.001″ (measured at no. 3 main bearing)
Reluctor wheel runout: 0.01–0.028″ (max)
Flywheel bolt base circle: 3.110″
Stroke: 3.622″
Main seal I.D.: 4.527″
Thrust wall width: 1.029-1.032″
Connecting Rods
Type: I-beam, powdered metal (PM) construction w/ cracked cap design
Bearing bore dia.: 2.224-2.225″
Rod bearing clearance: 0.0009–0.0025″
Bearing width: 0.9449″
Side clearance: 0.0433–0.0200″
Center to center: 6.098″
Piston pin bore dia: 0.9436
Piston pin boss width: 0.9449″
Piston pin press: 0.0008–0.0017″
Rod bolts: 9mm x 1.0 x 43mm

Cylinder Head


 

Camshaft Type: Hydraulic roller
Camshaft endplay: 0.001–0.012″
Journal diameter: 2.164-2.166″
Intake lift (at valve): 0.525″
Exhaust lift (at valve): 0.525″
Duration @ 0.050″: 204 deg int; 211 deg exh
LSA (lobe separation angle): 116 deg
Intake centerline: 118 deg
Exhaust centerline: 114 deg
Lobe lift (int): 0.306″
Lobe lift (exh): 0.305″
Camshaft runout: 0.002″ (max)

Combustion Chamber


Compression Ratio: 10.9:1 (with OE flat-top pistons)
Combustion chamber volume: 64.5cc
Intake port volume: 210 cc
Exhaust port volume: 70cc
Max. valve lift: 0.570″
Block deck flatness: 0.003″ (within 60.0″ area; 0.004″ overall length max)
Intake manifold deck flatness: 0.0031″
Exhaust deck flatness: 0.005″
Intake port type: Cathedral
Height: 4.732″ (deck to rocker cover seal surface)
Valve angle: 15 degrees
Intake valve: 2.000″
Exhaust valve: 1.55″
Valve guide material: powdered iron
Valve guide separation: 1.913″
Valve seat angles: 30/45/60 degrees
Valve stem dia: 0.315″
Comb. Deck surface flatness: 0.003″ within 60.0″ area
Comb. Deck surface flatness: 0.004″ (overall deck length)
Exh. Deck surface flatness: 0.005″
Int. deck surface flatness: 0.0031″

Oil Pump


 

Type: Gerotor, crankshaft snout driven
Diameter: 3.543″
Gear thickness: 0.421″
Pressure relief: 60 psig (factory)

Pistons


Type: Cast hypereutectic
Weight: 434 g
Piston to bore clearance: 0.0007–0.00212″
Piston deck height: + 0.008″ (above deck)
Top land thickness: 0.177″
Pin to pin bore clearance: 0.0004-0.00078″
Pin dia: 0.943-0.943″
Pin to conn. rod (press fit): 0.00027-0.00086″
Top compression ring thickness: 0.59″ (1.5mm)
Second ring thickness: 0.59″ (1.5mm)
Top ring end gap: 0.008–0.0160″
Second ring end gap: 0.015–0.027″
Top ring groove clearance: 0.0012-0.0040″
Second ring groove clearance: 0.0014–0.0031″
Oil rail thickness: 0.188″ (ea)
Oil rail gap: 0.009–0.031″
Oil top rail gap clocking: 25 degrees from top ring gap
Oil 2nd rail gap clocking: 25 degrees from oil expander ring
Oil groove clearance: 0.0005–0.0079″

Valvetrain


 

Rocker arm ratio: 1.70:1
Rocker type: investment cast, roller trunion
Valve lash net lash: no adjustment
Valve diameter: 2.00″ int; 1.55″ exh
Valve face angle: 45 degrees
Valve seat angle: 46 degrees
Valve seat runout: 0.002″ (max)
Valve seat width (int): 0.0400″
Valve seat width (exh): 0.0700″
Valve stem clearance (int): 0.001–0.0026″
Valve stem clearance (exh): 0.001–0.0026″
Oil seal installed height: 0.712–0.752″
Valve stem dia: 0.313–0.314″
Valve spring free length: 2.080″
Valve spring pressure closed: 76 lb@1.800″
Valve spring pressure open: 220 lb@1.320″
Spring installed height (int): 1.800″
Spring installed height (exh): 1.800″
Valve guide installed height: 0.682″ (from spring seat surface to top of valve guide)
Roller lifter dia: 0.700″
Valve material: stainless steel/hollow stems,
Oil capacity (OE): 5.5 qts w/filter; 5.0 qts w/o filter

Need some information on the LS2 that you didn’t find in our LS2 Specifications article? Leave us a question below!

3 COMMENTS

    • Hi Gary! Thanks for reading!

      Which car, truck or van did your iron LS2 6.0 liter come out of? there’s quite a few variations that would only be tracked down using part numbers. The 6.0 liter does have a lot of differences in cam height but mostly to LSA from one model to another. Let us know and we’ll try to help you out! Thanks for commenting!

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