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The ATK LM7-LB-3 GM LM7 383 Stroker 515HP Base is the first step in constructing your heavyweight car. Producing huge mid- to upper-end power along with noticeable idle, it delivers more than 515 horsepower and above 500 ft.lb torque for superior acceleration and muscle. This crate engine works with your existing components.
Engine Specifications:
Horsepower: 515+
Torque: 500+
Block: LM7 5.3L Gen 3
Bore/Stroke: 3.903 x 4.000
Year Range: 1999-2007
Displacement: 383CI
Crankshaft: K1 4340 Forged 24 tooth reluctor
Connecting Rods: Scat 6.125" Forged I Beams with ARP 8740 Bolts
Camshaft Bearings: Installed & Clocked to OEM Position
Cylinder Heads: CNC Ported Cathedral Port cores 2.02/1.60, dual valve springs, titanium retainers
Rocker Arms: OE Rocker Arms with trunion upgrade
Oil Galley Plugs: Installed & Sealed
Weight: 412
ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.
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