This short block is built for naturally aspirated engines up to 700hp. 

Block Information:

• Seasoned OE 1999-2007 GM LM7 5.3L
• Bore/Stroke: 3.903" x 4.000"
• Displacement: 383ci
• Camshaft Bearings: Installed and clocked to OEM position
• Freeze Plugs: Installed and sealed
• Oil Galley Plugs: Installed and sealed

Rotating Assembly:

• Crankshaft: K1 4340 forged 24 tooth reluctor wheel
• Rods: Scat Pro 4340 Forged I Beam Rods with ARP 8740 bolts
• Compression Ratio: 65cc= 10.7:1 67cc= 10.5:1 / 70cc= 10.2:1 
• Pistons: Wiseco 2618 Forged dished -8cc
• Rings: Wiseco GFX (alloy steel top ring)

  Recommended Components:

• Balancer: Internal balance
• Flexplate/Flywheel: Internal balance
• Head Gasket: .051" thickness or per application
• Oil: 10W40 Non synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application
• Oil Pump: Melling #689-10295 with high pressure spring

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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Please CLICK HERE for ATK Warranty