Overview

ATK High Performance Chevy LM7 5.7L/347 Short Blocks

ATK Chevy LM7 5.7L/347 short blocks provide a solid foundation for your build. Produced for the 1999-2007 trucks, LM7 engines are very popular engines to swap into musclecars and other LS swap vehicles. ATK High Performance Chevy LM7 5.7L/347 short blocks are built for naturally aspirated engines up to 700 hp.

Your ATK LM7 engine may include these components for optimal performance:

* Block: GM LM7 5.3L

* Bore/stroke: 3.903 x 3.622

* Displacement: 5.7/347 c.i.d.

* Crankshaft: OE reground 3.622 in., internally balanced 24-tooth

* Connecting rods: Scat Premium Pro 4340 forged I-beam with ARP 8740 bolts

* Pistons: Wiseco 2618 forged aluminum with coated skirts

* Piston rings: Wiseco GFX (alloy steel top ring)

* Camshaft bearings: Installed and clocked to OEM position

* Freeze plugs: Brass installed and sealed

* Oil galley plugs: installed and sealed

* Weight: 285 lbs.

Warranty