*Shown With Optional Upgrades

LS 427CI Boost Ready Up To 1500HP

Estimated Cost $27,995.00

Our LS 427CI Boost Ready Up To 1500HP long block engine package. This build features higher quality parts from the ground up. Some of this engines main features include an Dart SHP block, completely forged bottom end, custom ground roller camshaft, performance CNC ported cylinder heads, Head studs, full roller rocker arms and much much more.

  • LS 427CI Up To 1500HP Boost Ready Long Block:
  • Fully Machined Dart LSNext SHP Block
  • Main bolts
  • Forged Steel Stroke Crankshaft (Eagle, or Callies)
  • H-Beam Rods 6.125”
  • Custom Forged Pistons
  • Complete Assembly Balanced (Internal)
  • Performance Rings Hand Filed To Match Application
  • Custom Ground Roller Camshaft
  • Roller Lifters
  • Performance Timing chain set
  • Melling Oil pump
  • CNC Ported Performance Cylinder Heads
  • 2.165 8mm Bead Lock Intake Valve
  • 1.60 8mm Bead Lock Intake Valve
  • PAC 1.295” Dual Performance Valve Springs
  • 7 Degree Valve Retainers And Locks
  • MLS Head Gaskets
  • ARP Head Studs
  • Roller Rocker Arms
  • Chrome Moly Pushrods
  • Aluminum Timing And Rear Cover
  • Aluminum Valley Tray
  • Holley Oil Pan (302-x)
  • Aluminum Valve Covers (Black, or Polished)
  • Harmonic Balancer (SFI Approved)
  • Aluminum Intake Manifold (Holley, Or BTR)
  • Cable Driven Throttle Body (Black, or Shinny)
  • Fuel Injectors
  • Fuel Rails
  • Engines are photo documented during the building process
  • No Warranty!

All of the Proformance Unlimited turn-key LS engine packages will include an engine harness and an ECM to allow for full engine control and the best driving characteristics possible. Most other suppliers of turn-key engine packages will use out-of-date MEFI ECM’s and harnesses that do NOT allow the engine to make fueling or timing changes when running, nor will they allow for any needed changes with varying altitude. All of our turn-key engine packages will allow your engine to run and function exactly like a new car straight off of the production line! This will not only help the power output, but it will also help to maximize the fuel mileage! If you choose the Fitech ultimate efi w/trans control this will allow for full control of a GM’s 4-speed overdrive 4L60E, 4L65E, 4L70E, and 4L80E electronically-controlled transmission. The competition’s MEFI ECM and harness does not have this capability.

All of our turn-key engine packages will come standard with the GM Performance aluminum valve covers with a coil pack relocation kit and GM Hot Rod Oil Pan Kit. However, we do offer upgrades for all of these items, which are listed above in the drop-down menus. Let us know if you are looking for an item that is not listed, and we will be glad to provide you with a price! The aluminum coil pack relocation kit allows you to hide the ignition coil packs anywhere you would like under the hood, which provides you with a clean and uncluttered engine bay.

All Proformance Unlimited turn-key engine packages will come standard with a one-year, unlimited-mile warranty as standard! This will require all tuning to be performed by us. We stand behind our work, and when you purchase a Proformance Unlimited engine you are not only buying the parts but also the knowledge, experience, and know-how! We know what works and what is required to complete the installation!