- Engines & Components
- Engine - Assembled / Ready-to-Run
- ATK HP Crate Engines GM LS3 415ci / 620HP / 550TQ
In 2007, ATK launched a High Performance Division with one of the finest engine shops in the country. By reverse engineering all of their engines, they are able to eliminate any OEM deficiencies. This makes an ATK built crate engine have a superior design over the original engine by incorporating better components when needed. These quality built engines are offered in three different stages for ease of finishing an engine swap. ATK HP engines feature a 24 month/unlimited mile warranty.
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Engine Specifications
This is an LS3/415ci stroker based engine with LS3 aluminum heads making a power house with 620hp. Expect big mid to upper end power, will have a noticeable idle.
- Horsepower: 620 hp
- Torque: 550 lb/ft
Block Information:
- New GM LS3 aluminum
- Bore/Stroke: 4.065" x 4.000"
- Displacement: 415ci
Rotating Assembly:
- Crankshaft: Manley 4340 forged 58 tooth reluctor wheel
- Rods: Manley 4340 forged H beam with ARP 8740 bolts
- Compression Ratio: 10.3:1
- Pistons: Manley 2618 forged
- Rings: Moly
Camshaft Specs:
- Camshaft: Hydraulic roller
- Cam Duration @ .050": Intake 240 / Exhaust 256
- Cam Lift: Intake .625" / Exhaust .625"
- Lobe Separation Angle: 113lsa
- Timing Chain: Billet HD .250" roller
Cylinder Head Information:
- Cylinder Heads: GM LS3 aluminum rectangle port
- Combustion Chamber Size: 68.4cc
- Intake Runner Size: 260cc
- Valve Size: 2.165" Intake / 1.590" Exhaust
- Rocker Arms: OE 1.7 ratio with bushing upgrade
Base Engine Includes:
- Short Block
- Camshaft
- Timing Set
- Cylinder Heads
Complete Engines
- Consists of Base Engine Build
- Balancer
- Carburetor
- Coil Packs
- Intake Manifold
- Oil Pan
- Oil Pump
- Spark Plug Wires
- Spark Plugs
- Timing Cover
- Valve Cover