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.

Engine Specifications

This engine won the Baja 1000 for Team ATK, so expect big power and reliabilty.

• Horsepower: 275 hp
• Torque: 320 lb/ft

Block Information:

• OE 4.0L block
  • #535 or 665 for 1987-1990 engine
  • #569,341, or 449 for 1991-1998 engine
  • #327AB or #328AB for 1999-2006 engine
• Bore/Stroke: 3.935" x 3.895"
• Displacement: 4.7L

Rotating Assembly:

• Crankshaft: Scat nodular iron with .850" pilot hole
• Rods: OE with ARP 8740 rod bolts
• Compression Ratio: 9.3:1
• Pistons: Forged
• Rings: Moly

Camshaft Specs:

• Camshaft: Hydraulic flat tappet
• Cam Duration @ .050": Intake 213 / Exhaust 220
• Cam Lift: Intake .484" / Exhaust .507"
• Lobe Separation Angle: 113lsa
• Timing Chain: Single roller

Cylinder Head Information:

• Cylinder Heads: Ported OE cast iron
  • #686 for 1987-1990 engine
  • #630 for 1991-1997 engine
  • #0331 for 1999-2006 engine
• Rocker Arms: Harland Sharp billet aluminum roller rockers

Oil Pump Information:

• Oil Pump: Melling standard volume

 Base Engine Includes:

• Short Block
• Camshaft
• Timing Set
• Cylinder Head
• Oil Pump 

  Notes: This engine REQUIRES A piggy back chip or chassis dyno tun, 24lb injectors, 62mm throttle body, header, and full performance exhaust to function properly. Failure to do so can result in damage to the engine.