Chevy Reveals GEN5 Small Block

The all new Chevy V8 will be designated as the LT1. It features direct fuel injection and reversed position of intake and exhaust valves. Early reports from GM say it will make over 450 horsepower. Final numbers when the 2014 Corvette is released.

Specs released from GM:

  • Engine type: 90-degree V-8 with overhead valves; continuous VVT
  • Displacement: 6.2L (376 cubic inches)
  • Bore x Stroke (in / mm): 4.06 x 3.62 / 103.25 x 92
  • Cylinder block: cast aluminum with nodular main caps
  • Main bearing fasteners: six, including two cross-bolts per cap
  • Crankshaft: forged steel
  • Connecting rods: powder metal, 6.125 inches in length
  • Pistons: eutectic aluminum alloy
  • Compression ratio: 11.5:1
  • Cylinder heads: 319-T7 cast aluminum with 59.02cc combustion chambers
  • Valve angles (degrees): 12.5 intake, 12 exhaust
  • Intake valves: 2.13 inches (54mm) hollow
  • Exhaust valves: 1.59 inches (40.4mm) hollow sodium
  • Camshaft: Hydraulic-type with tri-lobe for fuel-pump drive
  • Camshaft lift: 0.551-inch (14mm) intake / 0.524-inch (13.3mm) exhaust
  • Camshaft duration: 200-degrees intake / 207-degrees exhaust (at 0.050-inch)
  • Lobe separation angle: 116.5 degrees
  • Fuel delivery: direct injection
  • Intake manifold: “runners in a box” design; composite construction
  • Throttle: 87mm electronically controlled throttle body
  • Ignition: 58X with individual coil-on-plug and iridium-tip spark plugs
  • Horsepower / kW: 450 / 335 (estimated)
  • Torque – lb.-ft. / Nm: 450 / 610 (estimated)
  • Max. engine speed 6,600 rpm (fuel cutoff)

The intake manifold is made from a composite material and is a “runner in box” design. Technology from the Corvette Race Team helped to develop this design.

The camshaft is the hydraulic roller type. Note the Tri-lobes on the rear, used for running the high pressure fuel pump for the direct injection.

The exhaust manifold has been completely redesigned. Note the 4 into 1 design.

The new LT1 piston design on the left vs. current 6.2 on the right.

The all new cylinder head design will have slightly splayed valves, approximately 2.5 degrees.

Note the reversed position of intake and exhaust valves and raised intake ports.

Here is the engine pictured complete with the top covers installed.