ATK High Performance Chevy LQ4 6.7L 500 HP Long Block Crate Engines 408BOOSTLB

ATK High Performance Chevy LQ4 6.7L 500 HP long block crate engines are designed to be used with a Turbo or Supercharger up to 15 psi. ATK engineered these engines to be affordable yet strong enough to handle a good amount of boost!

Engine Specifications:

• HP: 550
• TQ: 535
• Block: GM 6.0L iron LQ4 with ARP main studs
• Bore/Stroke: 4.030 in. x 4.000 in.
• Displacement (cu.in): 408
• Crankshaft: Manley 4.000 in. stroke internally balanced 24-tooth reluctor wheel
• Rods: Manley 4340 Forged 6.125 in. H-beam with ARP 2000 bolts
• Pistons: Forged
• Compression ratio: 10.2:1
• Rings: Total Seal CS/AP with steel top ring
• Camshaft: Hydraulic roller
• Cam specs: 226/230 at 50 .600/.575 113LSA
• Cylinder heads: ATK LS3 aluminum 68cc 2.165 in. / 1.590 in. valves
• Rocker arms: OE powdered metal 1.7 ratio with trunnion upgrade
• Oil pump: Melling 10296 high volume

Recommended Components:

• Oil: 10W30
• Oil filter: Wix
• Fuel system – OE EFI system or aftermarket
• Intake – Stock fuel injected or aftermarket
• Balancer -- Stock internally balanced
• Flex plate/Flywheel -- Stock internally balanced
• Timing -- Set to factory specifications via PCM module (tune required)
• Spark plug: NGK BR7
• Tuning: Chassis dyno tune required
• Firing order -- Stock
• Fuel – 91+ Octane
• Recommended stall converter -- 2800+ based on application
• Headers -- 1 7/8 in.+ depending on application