- Engines & Components
- Engine - Assembled / Ready-to-Run
- ATK HP GM 6.0L LS Crate Engines / 550HP / 490TQ
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 LQ4 based engine with LS3 aluminum heads making a very street able 550hp. Expect big mid to upper power, will have a noticeable idle. For optimal performance you will need headers, chassis dyno tune, and upgraded injectors.
- Horsepower: 550 hp
- Torque: 490 lb/ft
Block Information:
- Seasoned OE LQ4 or New Gen IV 6.0L iron block
- Bore/Stroke: 4.030" x 3.622" (LQ4 block) or 4.001" x 3.622" (Gen IV block)
- Displacement: 6.0L
Rotating Assembly:
- Crankshaft: Reground OE GM 24 tooth reluctor wheel
- Rods: Scat 4340 forged I beam 6.125" with ARP 8740 bolts
- Compression Ratio: 10.3:1
- Pistons: Manley forged
- Rings: Moly
Camshaft Specs:
- Camshaft: Hydraulic roller
- Cam Specs: Custom performance grind
- Lifters: GM LS7
- 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
Oil Pump Information:
- Oil Pump: Melling
Base Engine Includes:
- Short Block
- Camshaft
- Timing Set
- Cylinder Heads
- Oil Pump