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Instruction Sheets for Part Number HPE-408BOOSTLB
ATK High Performance Chevy LQ4 6.7L 500 HP Long Block Crate Engines 408BOOSTLB
Part Number: HPE-408BOOSTLB
ATK High Performance Chevy LQ4 6.7L 500 HP Long Block Crate Engines
Crate Engines, GM 408 LQ4 550 HP Stage 1 Long Block, 6.7L/408, Assembled, Internal Balance, Aluminum Cylinder Heads, Chevrolet, Small Block LS, Each
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Estimated Ship Date: Nov 9, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
408BOOSTLB
Part Type:
Product Line:
Summit Racing Part Number:
HPE-408BOOSTLB
Crate Engine Family:
Chevy LS
Actual Engine Displacement:
6.7L/408
Crate Engine Cylinder Head Material:
Aluminum
Engine Block Material:
Cast iron
Advertised Compression Ratio:
10.2:1
Assembled:
Yes
Engine Balance:
Internal
Cam Style:
Hydraulic roller, OE roller
Rear Main Seal Style:
1-piece
Intake Manifold Included:
No
Cylinder Heads Included:
Yes
Carburetor Included:
No
Throttle Body Included:
No
Distributor Included:
No
Oil Pan Included:
No
Valve Covers Included:
No
Timing Cover Included:
No
Water Pump Included:
No
Harmonic Balancer Included:
No
Flexplate Included:
No
Flywheel Included:
No
Air Cleaner Included:
No
Spark Plugs Included:
No
Spark Plug Wires Included:
No
Computer Included:
No
Wiring Harness Included:
No
Supercharger Included:
No
Remanufactured:
Yes
Quantity:
Sold individually.
Notes:
Engine is designed to be used with turbo or supercharger applications up to a maximum of 15psi.
ATK High Performance Chevy LQ4 6.7L 500 HP Long Block Crate Engines
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
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