"Nations Leader In Custom Building Turn-Key Performance Crate Engines Since 1978"

Toll Free: 1-800-267-3940 / International +1-732-695-2520


Chevy EFI Performance Engines

Proformance Unlimited now offers custom built Chevy EFI performance crate engines. These fuel injected crate engines are sold as complete drop in ready units. That are designed to replace any small block Chevy carbureted engine. These engines also work very well in your kit car project. Purchasing one of our turn-key fuel injected engines has many advantages for the engine installer such as no dyno-tuning required. All our efi engines are “plug & play”.

  We Now Sell Live Run Turn-Key Fuel Injected Engines  


Any One Of Our Engine Packages Can Be Designed For Use With MSD Atomic EFI

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 To Any Engine Package


↓Chevy Turn-Key Crate Engine Packages
New Package
350  320HP

Chevy 350 Cast Iron Head Crate Engine
  350 375HP
350 Chevy Crate Engine
Roller Crate Engine
  327 375HP
327 Crate Engine
Aluminum Heads
350 420 HP
350 Small Block Chevy
Aluminum Heads
Full Roller Engine
  350 440HP
Chevy 350-475hp
Aluminum Heads
With Dual Quad Edelbrock
  383 Stroker 380HP EFI
383 Chevy Crate Motor
20 Miles Per Gallon*
383 Stroker 400HP
Chevy 383-400hp
Aluminum Heads
Full Roller Engine
  383 450HP Stroker
383 450HP Chevy Stroker
Aluminum Heads
Full Roller Engine
   383 475HP Stroker
Chevy 383 475hp Stroker
Aluminum Heads
Full Roller Engine
383 500HP Stroker
383 Stroker
Fully Forged Bottom End
Roller Camshaft
  Supercharged 383
Supercharged 383
New Design
  427 Small Block
427 SBC Crate Engine
Aluminum Heads
Full Forged Bottom End
427 Big Block 450HP
427 Big Block
Edelbrock Aluminum Heads
   454 500HP
454 Big Block
Aluminum Heads
Full Roller Engine
  454 550HP
Big Block Chevy
Aluminum Heads
502 550HP
Chevy 502-600hp
Aluminum Heads
Full Roller Engine
  540 650HP Stroker
540 Big Block Stroker Engine
Aluminum Heads
Full Roller Crate Engine
  572 750HP
572 BBC Crate Engine
AFR Aluminum Heads
Full Roller Crate Engine

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Call Toll Free 24 Hrs.  1-800-267-3940

International +1-732-462-7283

Fax 1-732-462-7202