ATK SP109 Chevy LM7 Short Block Specifications:

• Block: Seasoned 5.3L LM7
• Year Rang: 1999-2007
• Bore/Stroke: 3.810” x 3.622”
• Displacement (cu.in): 330
• Crankshaft: OEM GM 24 tooth Reluctor wheel
• Rods: OEM GM Forged Powder Metal
• Pistons: Stock Hypereutectic flat top with 2 valve reliefs
• Compression Ratios: 61cc = 9.8:1 / 64cc = 9.5:1 / 68cc = 9.1:1 (can vary due to deck height/gasket thickness)
• Rings: Plasmamoly
• Camshaft Bearings: Installed & Clocked to OEM Position
• Freeze Plugs: Installed & Sealed
  
• Oil Galley Plugs: Installed & Sealed
• Oil: 5W30 Non synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application
• Notes: Crankshaft flange is .857” thick.

Recommended Components:

• Balancer- Internal balance
• Flex plate/ Flywheel- Internal balance
• Head Gasket: .051” or per application

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