Home » Racing Engines » Chevrolet Small Block Gen III LS1.R 427
Specifications
Chevrolet Small Block Gen III LS1.R 427ci (7.0 lt), 4 stroke, by Katech
Introduced in 2000
6985cc
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Dimensions
Cylinders arrangement: V8 (90o)
Strokes: 4
Bore x Stroke: 104.6 x 101.6 mm
Capacity: 6985 cc
Compression ratio: 12.5:1
Construction materials
A319 T5 (production) or A357-T6 aluminum alloy block with 234.7mm deck height and 111.8mm 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
OHV
camshaft in block with overhead valves (OHV), 2 valves/cyl - 16 valves total
Aspiration
Νatural with multipoint electronic Fuel Injection
2000: 2 x 33.1mm inlet restrictors
2004+: 2 x 31.4mm 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
Animation
Cooling and lubrication
water cooled with 11 lt coolant capacity, Reverse flow water cooling
dry sump, oil capacity 6.2 lit
Torque values
Models used and Output
Year | Model | Induction | Compression ratio | Power | Torque |
---|---|---|---|---|---|
2000 | Chevrolet Corvette C5-R | MPFI | 610 - 620 bhp / 463 KW @ 6200 rpm | 773 - 671 Nm / 495 ft lbs @ 5600 rpm | |
2004 | Chevrolet Corvette C5-R | MPFI | 570 bhp / 425 KW @ 5400 rpm | 841 Nm / 620 ft lbs @ 4400 rpm |
Source
LS1 5.7 lt of street version
Source
Source
Gen III (left) and Gen IV (right) engine