ATK SP75 LM7 5.3/5.7 Short Block -3.2cc Flat Top Pistons 24 Tooth

Engine Specifications:

• Block: GM LM7 5.3L (Iron LS1 / LS6)
• Year Range: 1999-2007
• Bore/Stroke: 3.903” x 3.622”
• Displacement (cu.in): 347
• Crankshaft: OE Reground .010”/.010” 24 tooth
• Rods: Scat premium pro 4340 I beam with ARP 8740 bolts
• Pistons: Wiseco 2618 forged -3.2cc flat top moly skirt coated
• Rings: Wiseco GFX (alloy steel top ring)
• Compression Ratios: 65cc = 10.3:1 / 67cc = 10.1:1 / 70cc = 9.7:1 (can vary due to deck height/gasket thickness)
• Camshaft Bearings: Installed and Clocked to OEM Position
• Freeze Plugs: Installed and Sealed
• Oil Galley Plugs: Installed and Sealed
  Recommended Components:
  
• Balancer- Internal balance
• Flex plate/ Flywheel- Internal balance
• Head Gasket: .051” or per application
• Oil Pump: Melling #10295 with high pressure spring
  Engine Info:
  
• Oil: 10W40 Non synthetic for first 3000 miles
• Oil Filter: Wix or K and N per application
  Disclaimer:
  
  The recommended components listed are ATK’s recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you’re not certain about a component to use. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.