Chevrolet Small Block Gen III LS1.R 427 (2000)
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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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Click here for engine tolerances

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

╬Łatural 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
2c2107b3b8a88307702cc37e1acc3458-1000.jpg Source
hrdp-9808-01-o%2Bthe-LS1-engine%2Bcutout.jpg Source
LS1 5.7 lt of street version
alms-mid-ohio-2002-corvette-racing-chevrolet-corvette-c5-r-engine.jpg Source
vemp_0704_01_z%2Bcorvette_cylinder_block_comparison%2Bc5r_and_ls7_blocks.jpg Source
Gen III (left) and Gen IV (right) engine
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