ATK HP97 High Performance Crate Engine:

• Horsepower: 385
• Torque: 390
• Block: GM 5.3L iron LM7
• Bore/stroke: 3.809 x 3.622
• Year Range: 1999-2007
• Displacement: 323 c.i.
• Crankshaft: OEM GM 3.622 in. stroke internally balanced 24 tooth reluctor wheel .857 in. flange
• Connecting rods: OE GM forged powder metal 6.093 in. stock bolts
• Pistons: Hypereutectic dish
• Piston rings: Moly
• Compression ratio: 9.5:1
• Camshaft: Hydraulic roller
• Camshaft specifications: Custom grind
• Camshaft bearings: Installed and clocked to OEM position
• Cylinder heads: OE aluminum 61.15cc w/1.89/1.55 in. valves
• Freeze plugs: Brass installed and sealed
• Rocker arms: OE powdered metal 1.7 ratio
• Oil Galley plugs: Installed and sealed
• Weight: 385 lbs.

FAQ

Is it better to buy a crate engine or rebuild?

• It depends on specific needs. Crate engines like the ATK HP97 offer convenience, while rebuilding allows customization.
• Crate engines save time, while rebuilds offer tailored performance.

How much horsepower can you get out of a 5.3 LS?

• With modifications, a built 5.3 LS engine, such as the ATK 5.3, can reach over 400-500 horsepower reliably.
• Performance upgrades enhance the 5.3's power potential.

Which GM LS engine has the most horsepower?

• The L33 crate engine is among the powerful LS engines, delivering impressive horsepower and torque.
• Its stock form offers robust performance for various applications.

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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