- Engines & Components
- Engine - Assembled / Ready-to-Run
- ATK HP Crate Engines GM LS 383ci / 515HP / 505TQ
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 LM7 based engine with CNC ported cathedral port aluminum heads making a very street able 515hp. 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: 515 hp
- Torque: 505 lb/ft
Block Information:
- OE LM7/5.3L iron
- Bore/Stroke: 3.903" x 4.000"
- Displacement: 383ci
Rotating Assembly:
- Crankshaft: K1 4340 forged 24 tooth reluctor wheel
- Rods: K1 4340 forged I beam 6.125" with ARP 8740 bolts
- Compression Ratio: 10.3:1
- Pistons: Wiseco forged
- Rings: Moly
Camshaft Specs:
- Camshaft: Hydraulic roller
- Cam Duration @ .050": Intake 218 / Exhaust 224
- Cam Lift: Intake .604" / Exhaust .604"
- Lobe Separation Angle: 112lsa
Cylinder Head Information:
- Cylinder Heads: OE aluminum CNC ported cathedral port, dual valve springs, and titanium retainers
- Valve Size: 2.02" Intake / 1.60" Exhaust
- Rocker Arms: OE 1.7 ratio
- Timing Chain: Billet HD .250" roller
Oil Pump Information:
- Oil Pump: Melling
Base Engine Includes:
- Short Block
- Camshaft
- Timing Set
- Cylinder Heads
- Oil Pump