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427 Small Block Chevy Turn-Key Crate Engine With 550 HP
Extremely Wild Street/Strip Power Plant

434 small block chevy 

* Engine Shown With Optional Upgrades:


Chevy 427 small block stroker with 550HP Hydraulic roller fully forged  bottom end engine combination. This engine can be custom designed to tailor to your specific needs. When we designed this engine combination we had the weekend racer in mind who can drive to the strip and back home. We can also custom paint your engine to match your vehicle at your request. We are a dealer for March Performance serpentine belt systems if you choose them as your pulley manufacture.  We can also assist you in choosing the proper performance street/strip transmission and stall speed converter combination for your vehicle and have it shipped directly to you as your engine is being built.

See Below The Quality Of Parts We Use In Our Engines

Short Block Assembly:
  • Fully machined New Dart SHP 4 bolt main block with 4.125 bore
  • Block painted with 3 coats of high temp ceramic engine paint customers choice of color
  • Eagle 4340 forged steel crankshaft 4.000 stroke
  • Eagle H-Beam connecting rods with ARP bolts 
  • High performance pistons (Speed-Pro, Keith Black, SRP, or Mahle)
  • Performance rods and main bearing (Clevite, King or Federal Mogul)
  • Performance rings hand filed to match application
  • Rotating assembly is balanced
Fully Dressed Turn-Key Crate Engine Assembly:
  • All the above plus the following:
  • Comp Cams custom ground hydraulic roller camshaft
  • Hydraulic roller lifters
  • Three piece true double roller timing set
  • Performance aluminum cylinder heads
  • Screw in studs and hardened guide plates
  • Manley chrome moly push rods
  • Performance roller rockers 
  • Melling high volume oil pump and screen
  • Zinc plated oil pan
  • Chrome dipstick and tube
  • Chrome timing cover
  • SFI approved Professional Products performance balancer
  • Fel-Pro gaskets
  • Edelbrock Victor Jr. intake manifold
  • Chrome thermostat housing
  • Holley 850cfm carburetor
  • Chrome air cleaner
  • Pro-Billet distributor (Requires MSD 6AL Ignition Control)
  • MSD Blaster II coil and bracket
  • Auto-Lite spark plugs
  • Custom fit Taylor 8mm ignition wires (Color Of Choice Black, Red, Blue, Yellow, Green, Orange No Extra Charge) 
  • Water pump
  • Chrome valve covers
  • Chrome breather
  • Engines are photo documented during the building process
  • Each engine is dyno tested, timing set and carburetor adjusted for optimum performance
  • We video tape your engine and send you a copy

Only $12,200


We Are Constantly Running Engine Deals

Please Call Us For The Most Up To Date Pricing

Or E-Mail Us For More Information!



**Customer Review of our Chevy 427**
I don't have a lot of time to explain everything I am doing and make a pretty letter. But I wanted to let you know what is going on in my neck of the woods.

After deciding to order and engine from you 6 months, I place the order 4 months, then looked for a car 8 months +/-.

I wanted to use a pre computer car due to the wiring. After no luck on choice, I designed a plan to inst ll into Suburban approx $8000.00 plan.

I now have a super suburban stealth vehicle I drive every day.

I am continuing to modify ad could not be happier with your work. At a younger time in life I had a Chevelle 396/427/454. This engine is better and runs like a sewing machine. Everyone is in awe.

Most cannot see what is making the noise even when looking right at me.

I have tuned the system tow and fly. I am still running 342 gears and will soon look to cangetem to 411 or 456. But for now it still runs very well.

I went through a stock mid-pipe system with flow tech headers to 2.5" Gibson out the back. I have now change to 3" all the way and now will install a second system which will work off of a 2-3" cutouts to activate quite mode through 2.5" additional mufflers.
This way I can be quite of run as needed.

David B

* I do plan to use you business again. And I may build a display of the components and go to shows with your business at the top  
                                                                                                                                           Click here for more Proformance Unlimited crate engine reviews



Customize Your Crate Engine With These Products


Pulley Systems

March Performance
Alternator Only

This system includes the following items:

  • 105 Amp alternator chrome
  • Alternator pulley
  • Crankshaft pulley
  • Water pump pulley
  • Aluminum bracket with fan & nose cover
  • Belt tensioning bar
  • Serpentine belt
  • Installed on your engine

Add $1,000

Alternator & Power Steering

This system includes the following items:

  • 105 Amp alternator chrome
  • Power Steering Pump
  • Alternator pulley
  • Crankshaft pulley
  • Water pump pulley
  • Power steering pump pulley
  • Aluminum bracket with fan & nose cover
  • Belt tensioning bar
  • Serpentine belt
  • Installed on your engine

Add $1,675

Alternator, Power Steering &
Air Conditioning

This system includes the following items:

  • 105 Amp alternator chrome
  • Power Steering Pump
  • AC Pump
  • Alternator pulley
  • Crankshaft pulley
  • Water pump pulley
  • Power steering pump pulley
  • AC pump nose cover
  • Aluminum bracket with fan & nose cover
  • Belt tensioning bar
  • Serpentine belt
  • Installed on your engine

Add $2,100

Block Options

Dart SHP Block: 

  • Cast Iron
  • Splayed 4-Bolt Main
  • 1-Piece Rear Main Seal
  • Factory Roller
  • 1-Piece Rear Main Seal

Add $1,000


New GM Performance Block:

  • Cast Iron
  • 4-Bolt Main
  • 1-Piece Rear Main Seal

Add $250

Cylinder Heads Options

Dart CNC Cylinder Heads:

  • Combustion Chamber Volume (cc): 64
  • Intake Runner Volume: 227cc
  • Exhaust Runner Volume: 66cc
  • Intake Valve Size: 2.08
  • Exhaust Valve Size: 1.60

Add $1,000

cylinder heads 


AFR Cylinder Heads:

  • Fully CNC Ported
  • Combustion Chamber Volume (cc): 65
  • Intake Runner Volume: 180cc
  • Exhaust Runner Volume: 64cc
  • Intake Valve Size: 2.02
  • Exhaust Valve Size: 1.60

Add $800


Holley Carburetor
(Includes braided fuel line for carburetor)

  • 750CFM
  • Model 4150 Ultra HP
  • Mechanical Secondaries
  • Electric Choke
  • 4 Corner Idle
  • Braided Fuel Line  

Add $350


MSD Starter

  • Dyna Force Starter
  • Small Block Chevy
  • Big Block Chevy
  • High Torque
  • 153 and 168 Tooth
  • Straight Bolt Pattern

Add $275

MSD 6AL 6420

MSD 6 Series Ignition Box

  • Higher output with 530 primary volts and 135mJ of spark energy
  • Efficient components use less current to produce more power
  • Set an rpm limit on the 6AL with two rotary dials in 100 RPM increments
  • Same bolt pattern as the original 6AL with a lower profile housing
  • Built-in LED for system checks
  • All wires exit the same side through a locked, sealed connector

Add $300



  • 153 or 168 tooth

Add $375


Fuel Delivery Systems

The Atomic EFI outshines the competition in ease of installation and performance! The MSD annular ring injection design produces an air/fuel charge with much better mixture as well as an even distribution among the cylinders that our competition cannot match. Better AFRs equal better idle quality, better starting, and better overall drivability throughout the rpm range. You and your engine will be glad when you Go Atomic.

 Kit Includes:

  • Throttle Body Assembly (An exact swap for a 4150 Holley)
  • (4) port style injectors
  • EMS (Engine Management System)
  • Comprehensive Instruction Manual
  • All harnesses and connectors (Much less harnessing than other systems)
  • Idle Air Control - Built in to the throttle body
  •  Coolant Temperature Sensor - 3/8-NPT threads for most manifolds
  • Throttle Position Sensor
  • Wideband O2 Sensor and cable (Many competitive units are narrowband)

Add $2,700

***Firmware updates can be found at the following link:
Webber 48mm Stack Induction

Webber Stack Induction:

  • Webber Stack Induction Aluminum Intake Manifold
  • Webber 48mm IDA Carburetors
  • Chrome Stacks
  • Webber Carburetor Fuel Line
  • Webber Carburetor Throttle Linkage

Add $ Call

Chevy 350-475hp

Edelbrock Dual Quad's:

  • Performer RPM Dual Quad Air-Gap intake With EnduraShine Finish
  • 2 Thunder Series AVS carburetors With EnduraShine Finish
  • Progressive throttle linkage
  • Fuel line
  • Edelbrock Chrome Dual Carburetor Air Cleaner

Add $1,300

Dress Up

Custom Paint

Custom Painted Engine:

  • Have a custom painted car?  Why not have a custom painted engine?  Give us your paint code and we'll do the rest.

Add $300

Chevy Black Out Kit

Old School Look:

  • One of the most popular and durable dress-up kits available today! This black crinkle kit with its distinctive look and boldly striking wording comes with everything you need for race day or show day!

Add $245


TH350 Transmission

Automatic Transmission Package's:

  • The world�s finest transmission packages, custom made for Proformance Unlimited.
  • Each transmission package is tailored to your engine, and test driven to ensure maximum performance.
  • They build them from Mild to Wild, if you�ve got the horsepower, they have the transmission.

TH-350 Or TH-400 Add $1,800

TH-350 Or TH-400 Add $1,800

700R4 Or 200R4 Add $2,650

Whether your vehicle is a hot rod, street car, race car, or even a tow truck, here at Proformance Unlimited we are here to help design and build the combination that best suits your vehicles needs. Please browse our engine combinations listed below or custom design one of your own. Proformance Unlimited is best known for our precision custom designs. From that special built stroker engine to that turn-key drop in ready crate engines, call Doug or Steve and we will be happy to answer any of your questions.

All engines are custom built to order for total customer satisfaction

Credit cards accepted

Call us today for a quote





  12750   Updated 11/3/2014

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