Home » Racing Engines » Chevrolet Small Block Gen IV LS7 427
Specifications
Chevrolet Small Block Gen IV LS7 427ci (7.0 lt), 4 stroke
Introduced in 2006
7008cc
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Service specs
Dimensions
Cylinders arrangement: V8 (90o)
Strokes: 4
Bore x Stroke: 104.775 x 101.6 mm
Capacity: 7008 cc
Compression ratio: 11.0:1
Construction materials
A319 T5 (production) or A357-T6 aluminum alloy block with 235mm deck height and 111.7mm bore spacing, A356 T6 aluminium head
nodular iron crankshaft with 5 main bearings 65mm diameter
connecting rod length between centers 155.6mm, big end bearing diameter 53.3mm
Cylinder-head
crossflow design
camshaft in block chain driven with pushrod and overhead titanium valves (OHV), 2 valves/cyl - 16 valves total
56 mm diameter intake valves, 41 mm diameter sodium-filled exhaust valves, 12o angle between inlet/exhaust valve axis and vertical, inlet/exhaust valves on the same longitudinal plane
Aspiration
Νatural with multipoint electronic Fuel Injection
2 x 28.8mm inlet restrictors
Ignition
ECU
firing order, 1-8-7-2-6-5-4-3, with Driver side 1 3 5 7, Passenger side 2 4 6 8
Cooling and lubrication
water cooled
dry sump
Torque values
Models used and Output
| Year | Model | Induction | Compression ratio | Power | Torque |
|---|---|---|---|---|---|
| 2006 | Chevrolet Corvette C6 Z06 GT2 | MPFI | 11.0:1 | 470 hp at 6300 rpm | 470 lb·ft (640 N·m) at 4800 rpm |
| 2006 | Mosler MT900R Z06 GT2 | MPFI | 11.0:1 | 470 hp at 6300 rpm | 470 lb·ft (640 N·m) at 4800 rpm |
Source
SourceGen III (left) and Gen IV (right) engine