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Engine Specifications

GENERAL SPECIFICATIONS

Application Specification
Displacement 350 Cu. In. (5.7L)
Bore 3.898" (99.00 mm)
Stroke 3.622" (92.00 mm)
Compression Ratio
LS1 10.1:1
LS6 10.5:1
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS SPECIFICATIONS

Application In. (mm)
Crankshaft
End Play .0015-.0078 (.04-.22)
Runout At Rear Flange (Maximum) .0020 (.050)
Main Bearings
Journal Diameter 2.558-2.559 (64.993-65.007 )
Journal Out-Of-Round
Standard .0001 (.003)
Wear Limit .0003 (.008)
Journal Taper
Standard .0004 (.010)
Wear Limit .0008 (.020)
Reluctor Ring
Runout (1) .010 (.25)
Oil Clearance .0007-.0021 (.018-.054)
Connecting Rod Bearings
Journal Diameter 2.0991-2.0999 (53.318-53.338)
Journal Out-Of-Round
Standard .0002 (.005)
Wear Limit .0004 (.010)
Journal Taper (2)
Standard .0002 (.005)
Wear Limit .0004 (.010)
Oil Clearance .0009-.0025 (.023-.065 )
(1) Measured .40" (1 mm) below tooth diameter
(2) Maximum for half of journal length.
CONNECTING RODS SPECIFICATIONS

Application In. (mm)
Bearing Bore Diameter 2.224-2.225 (56.50-56.52)
Maximum Bend (1)
Maximum Twist (1)
Side Play .004-.020 (.11-.51)
(1) Replace rod if any bend or twist exists.
PISTONS, PINS & RINGS SPECIFICATIONS

Application In. (mm)
Piston Clearance
Standard .0007-.0021 (.018-.054)
Wear Limit .0007-.0021 (.018-.054)
Pins
Diameter .9447-.9448 (23.997-24.000)
Rod Fit (Interference) .0008-.0017 (.020-.043)
Rings
No. 1
End Gap .009-.015 (.23-.38)
Side Clearance .00157-.00335 (.040-.085)
No. 2
End Gap .0017-.0025 (.044-.064)
Side Clearance .00157-.00315 (.040-.080)
No. 3 (Oil)
End Gap .0070-.0271 (.178-.688)
Side Clearance .0004-.0087 (.010-.220)
CYLINDER BLOCK SPECIFICATIONS

Application In. (mm)
Cylinder Bore
Diameter 3.897-3.898 (99.000-99.018)
Taper (Thrust Side) .0007 (.018)
VALVES & VALVE SPRINGS SPECIFICATIONS

Application Specification
Valves
Face Angle 45°
Margin (Minimum) .050" (1.25 mm)
Stem Diameter .313-.314" (7.955-7.976 mm)
Valve Springs
Free Length
Except LS6 2.08" (52.90 mm)
LS6 2.10" (53.40 mm)
Installed Height 1.80" (45.75 mm)
Lbs. @ In. (N @ mm) 
Valve Spring Pressure
Except LS6
Valve Closed 76 @ 1.80 (340 N @ 45.75)
Valve Open 220 @ 1.32 (980 N @ 33.55)
LS6
Valve Closed 90 @ 1.80 (400 N @ 45.75)
Valve Open 259 @ 1.28 (1150N @ 32.42)
CYLINDER HEAD SPECIFICATIONS

Application Specification
Valve Seats
Intake Valve
Seat Angle 46°
Seat Width .040" (1.02 mm)
Exhaust Valve
Seat Angle 46°
Seat Width .070" (1.78 mm)
Valve Guides
Stem-To-Guide Oil Clearance
Standard .0010-.0026" (.025-.066 mm)
Wear Limit .0037" (.093 mm)
CAMSHAFT SPECIFICATIONS

Application In. (mm)
End Play .001-.012 (.025-.305)
Journal Diameter 2.164-2.166 (54.99-55.04)
Lobe Lift
2000
Intake .277 (7.04)
Exhaust .281 (7.13)
2001
LS1
Intake .274 (6.96)
Exhaust .281 (7.13)
LS6
Intake .306 (7.78)
Exhaust .306 (7.78)