VALVETRAIN CHART
LS3, LS7 & LS9 ENGINE COMPARO
LS3 6.2L (normally aspirated)
Displacement: 376ci
Bore x Stroke: 4.06 x 3.62 in
Block: cast aluminum with 6-bolt, cross-bolted main bearing caps
Crankshaft: nodular iron
Connecting rods: powdered metal
Pistons: hypereutectic (cast) aluminum
Camshaft: hydraulic roller
Valve lift: 0.0551/0.522-inch
Camshaft duration: 204/211 degrees @ 0.050-in
Cylinder heads: LS3 rectangular port; 68cc combustion chambers (as cast)
Valve size: 2.16/1.59-in
Compression ratio: 10.7:1
Rocker arms: investment cast, roller trunnion
Rocker arm ratio: 1.7:1
Balanced: internal
Oiling system: conventional wet sump, gerotor pump, 6-quart capacity
Maximum engine speed: 6,600rpm
Output at flywheel: 429hp @ 5,900rpm; 424 lb-ft @ 4,600rpm
LS7 7.0L (normally aspirated)
Displacement: 427ci
Bore x Stroke: 4.125 x 4.00 in
Block: cast aluminum with 6-bolt, cross-bolted steel main bearing caps
Crankshaft: forged steel
Connecting rods: forged titanium
Pistons: hypereutectic (cast) aluminum
Camshaft: hydraulic roller
Valve lift: 0.591/0.591 in
Camshaft duration: 211/230 degrees @ 0.050-in
Cylinder heads: CNC-ported LS7, 70cc combustion chambers
Valve size: 2.20/1.61-in
Compression ratio: 11.0:1
Rocker arms: investment cast, roller trunnion
Rocker arm ratio: 1.8:1 (offset, intake only)
Balanced: internal
Oiling system: dry sump, dual gerotor pump, 10.5-quart capacity
Maximum engine speed: 7,000rpm
Output at flywheel: 505hp @ 6,300rpm; 470 lb-ft @ 4,800rpm
LS9 6.2L (supercharged/intercooled)
Displacement: 376ci
Bore x Stroke: 4.06 x 3.62 in
Block: cast aluminum with 6-bolt-cross-bolted steel main bearing caps
Crankshaft: forged steel
Connecting rods: forged titanium
Pistons: forged aluminum, dished
Camshaft: hydraulic lifter
Valve lift: 0.555/0.555-in
Camshaft duration: 230/211 degrees @ 0.050-inch
Cylinder heads: Modified LS3 (L-92 type)
Valve size: 2.16/1.59-in
Compression ratio: 9.1:1
Rocker arms: investment cast, roller trunnion
Rocker arm ratio: 1.7:1
Balanced: internal
Oiling system: dry sump, dual gerotor, 10.5-quart capacity
Maximum engine speed: 6,600rpm
Positive manifold pressure: 10.5psi
Output at flywheel: 620+hp @ 6,500rpm; 595 lb-ft @ 4,000rpm
