ATK Engines High Performance Short Block GM LS 383ci
059-SP80
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LS Gen III/IV
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= 11.3:1 67cc= 11.1:1 / 70cc= 10.7:1
- Pistons: Wiseco 2618 forged flat top -3cc
- 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
Specifications:
What main bolts and rod bolts were used? oem or arp?
Are the rings gapped for boost?
Can I spray this short block with a 200 shot of nitrous as is or will the rings need regapped.
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