ATK SP76 LM7 5.3/5.7 Short Block -11cc Dished Pistons 24 Tooth



Lead Time: Estimated: 4 - 6 weeks


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  • $225 Core charge - $225.00


Engine Specifications:
• Block: GM LM7 5.3L (Iron LS1 / LS6)
• Year Range: 1999-2007
• Bore/Stroke: 3.903” x 3.622”
• Displacement ( 347
• Crankshaft: OE Reground .010”/.010” 24 tooth
• Rods: Scat premium pro 4340 I beam with ARP 8740 bolts
• Pistons: Wiseco 2618 forged -11cc dished moly skirt coated
• Rings: Wiseco GFX (alloy steel top ring)
• Compression Ratios: 65cc = 9.5:1 / 67cc = 9.3:1 / 70cc = 8.9:1 (can vary due to deck height/gasket thickness)
• Camshaft Bearings: Installed & Clocked to OEM Position
• Freeze Plugs: Installed & Sealed
• Oil Galley Plugs: Installed & 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&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.


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