*Shown With Optional Upgrades
LS 427CI 625HP Crate Engine
Estimated Cost From: $16,290.00
Our LS 427CI 625HP crate engine package is designed to out perform GM’s LS7 Corvette crate engine. This build features higher quality parts from the ground up at a more reasonable cost. Some of this engines main features include an aluminum GM 6 bolt main block, completely forged bottom end, custom ground hydraulic roller camshaft, performance LS3/L92 cylinder heads, roller rocker arms and a muscle car oil pan designed to fit almost every application. We can also assist you in picking out the correct motor mount and header combination that will fit your hot rod, as well as a complete serpentine pulley kit and transmission.
- LS 427CI 625HP Complete Crate Engine
- Fully Machined LS aluminum Block
- Forged steel 4.125” stroke crankshaft (Eagle, Scat, or LPC)
- 6.125″ Connecting Rods With ARP Bolts (Eagle, Scat, or LPC)
- Performance Forged Pistons (Mahle, Icon, DSS, or JE)
- Complete Assembly Balanced (Internal)
- Performance rings hand filed to match application
- Custom Ground Hydraulic Roller Camshaft
- Hydraulic Roller Lifters
- Performance Timing chain set
- Melling Oil pump
- LS3/L92 Rectangle Port Aluminum Performance Cylinder Heads
- 2.165 Pro Series Intake Valves
- 1.590 Pro Series Exhaust Valves
- 1.295” Dual Performance Valve Springs
- 7 Degree Valve Retainers And Locks
- Performance Rocker Arms
- Chrome Moly Pushrods
- Main bolts
- ARP Head bolts
- Aluminum Timing And Rear Cover
- Aluminum Valley Tray
- Muscle Car Stroker Oil Pan
- Aluminum Valve Covers (Black, or Polished)
- Harmonic Balancer
- Water Pump
- Fabricated Aluminum Intake Manifold (Black, or Shinny)
- Cable Driven Throttle Body (Black, or Shinny)
- Fuel Injectors
- Fuel Rails
- LS3 Style Coils
- Coil Harness
- Spark Plugs
- 8.5mm Ignition Wires
- Holley Terminator X ECU
- Engine Wiring Harness
- Fuel Injector Harness
- Wide Ban O2 Sensor
- Intake Air Temperature Sensor
- Crankshaft Position Sensor
- Camshaft Position Sensor
- Engine Coolant Temperature Sensor
- Manifold Air Pressure Sensor
- Oil And Filter
- Engines are photo documented during the building process
- 2 Year Unlimited Miles Warranty
Customize Your Crate Engine
Break In And Tune Yourself
- Customer Is responsible for
- Tuning EFI
- Ring Break-In
Hot Run Tested
- Proformance Unlimited will do the initial break in.
- Create base tune.
- Break in rings
- Check for leaks
- Heat cycle the engine
- Check for proper oil pressure
Dyno Tested And Tuned (Doug's Way)
Proformance Unlimited measures over 30 parameters that are monitored and logged to the computer during each engine test. A complete printout, including graphs.
We tune your engine on the dyno for maximum power. No more endless trial and error methods at the track are required. You see your results instantly! Dynamometer testing costs a fraction of what you have invested. Take the guesswork out of tuning - by dynoing !
- Your engine will be broken in under various load conditions
- Tested in real world conditions through headers and mufflers
- Precise horsepower and torque rating with graph and numerical print out
- Induction system tuned for optimal performance
- Dyno session video taped
Alternator Only
Add $1,675
Alternator, Power Steering
Add $1,875
Alt, PS, AC
Add $2,300
4L80E Transmission Package
Starting @ $4,950
TKO-600 Transmission Package
Starting @ $5,400
Becool Radiator Combo
Starting @ $1,399
Fuel Tank With Electric Pump
Starting @ $550
Conversion Install Package:
Starting @ $1,550
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!