Racing Engine Design 6.0L LS Chevy Motor - The Iron Lung

By The Numbers

426ci LS Chevy

Block: 6.0L LS iron truck, overbored .060 inch

Bore: 4.06 inches

Stroke: 4.10 inches

Displacement: 424.6 ci

Compression ratio: 11.5:1

Crankshaft: Manley, standard weight

Camshaft: Bullet hydraulic roller

Timing chain: Cloyes

Lifters: COMP limited-travel hydraulic

Pushrods: COMP Cams 7.500-inch (3/8-inch diameter)

Springs: Beehive

Installed height: 1.85 inch

Spring load, closed: 160 pounds on the seat

Spring load, open: 410 pounds at 1.160-inch lift

Retainers: Manley 7-degree steel

Valve locks: Manley 7-degree beadlock

Duration, intake: 237 degrees at .050

Intake lift: .648 inch

Duration, exhaust: 237 degrees at .050

Exhaust lift: .648 inch

Rockers: Harland Sharp

Rocker ratio: 1.8/1.8

Lobe separation: 104 degrees

Installed centerline: 102 degrees

Ring pack: Total Seal; 1.5mm, 1.5mm, 3.0mm oil

Ring endgap: .017-inch top, .026-inch second

Piston: Manley forgings with coated skirts, custom tops

Piston clearance: .006 inch

Main studs: ARP

Rods: Eagle 6.125-inch H-beam

Main bearings: Clevite H

Rod bearings: Clevite HN

Main journal diameter: OEM

Rod journal diameter: 2.100 inches

Main clearance: .0025 inch

Rod clearance: .0024 inch

Cylinder heads: GM LS7

Head bolts: ARP studs

Intake manifold: Mast Motorsports two-piece

Intake port flow: 352 cfm at .550-inch lift

Exhaust port flow: 254 cfm at .550-inch lift

Intake valve: Manley stainless 2.200 inch

Exhaust valve: Manley stainless 1.540 inch

Cylinder head gaskets: Fel-Pro 1041 (.041 inch)

Piston/head clearance: .019 inch

Engine gaskets: OEM

Throttle body: 114mm TPIS

Fuel rails: FAST

Injectors: FAST 36 lb/hr

Header: Schoenfeld 1.750-inch diameter with 3-inch merge collector

Coils: MSD

Ignition: FAST XIM

Spark plug wires: Champion

Damper: ATI with 10 percent underdrive steel hub with aluminum shell

Water pump: Meziere electric

Oil pan: stock 6.0 truck

Oil pump: Melling Select

Oil: AMSOIL 5W/30