The LS series of engines from GM Powertrain have broken new ground for efficiency and performance from a pushrod platform engine. The LS3 continues the engineering breakthroughs with revised cylinder heads featuring rectangle ports borrowed from the vaunted LS7. The heads feature 63 cc combustion chambers, 2.16-inch intake valves, and 1.59-inch exhaust valves. The camshaft features an aggressive .551-inches of lift on the intake side with less overlap (than the LS2) for even greater airflow and power. Rocker arms with a 1.7:1 ratio sit on top of the heads.
In the bottom end, the aluminum 6-bolts/main block features 4.06-inch bores and 3.62-inch stroke. A nodular iron crankshaft, powdered metal rods, and aluminum pistons (10.7:1 compression ratio) round out a rev-happy short block. Red line for the LS3 comes at 6600 rpm, and you will get there very quickly. With a high-tech GM foundation, aluminum block, and high flowing rectangular-port heads, the LS3 is the new standard in the small block world. The LS3 helps power the new Corvette to a top speed of 190 mph. What will it power you to?
- Power: 480 HP @ 5900 RPM, 424 ft. lbs. of torque @ 4600 RPM.
- Displacement: 376 CID, 6.2L.
- Bore x Stroke: 4.060” x 3.620”.
- Compression Ratio: 10.7:1.
- Recommended Fuel: 98 Octane.
- Block: Cast Aluminum with 6 bolt cross bolted main caps.
- Crankshaft: Nodular Iron.
- Connecting Rods: Powdered Metal Steel.
- Pistons: Hypereutectic Aluminum.
- Camshaft: Steel Hydraulic Roller Tappet.
- Cam Lift: .551” Intake / .522” exhaust.
- Cam Duration @ .050”: 204 deg. Intake / 211 deg. Exhaust.
- Lobe Separation: N/A.
- Cylinder Heads: Aluminum L92/LS3 style ports.
- Combustion Chamber: 68cc.
- Valves: 2.165” Intake/ 1.590” Exhaust.
- Rocker Arms: Cast Roller Trunnion, 1.7:1 Ratio.
- Balance: Internal.
- Reluctor: 58X.
- Maximum GM Recommended RPM: 6600.
- Fully GM assembled long block.
- Ignition Coils, Plug Wires and Spark Plugs.
- Oil pump, pick-up and Camaro oil pan.
- Exhaust Manifolds.
- Intake, Injectors and Throttle Body.
- 14” Auto Trans Flexplate.
- Harmonic Balancer.
- Front timing cover.
- Aluminum Water Pump.
- Oil Filter.
- Passenger Side RH Oil Dipstick and Tube.