"Nations Leader In Custom Building Chevy Performance Engines Since 1978"

Toll Free: 1-800-267-3940 / International +1-732-462-7283
 

 

Chevy Engines With An Attitude

 

Pro-Formance Unlimited takes great pride in all of our engines. Whether your vehicle is a Corvette, Camaro, Nova, Chevelle, or just an early 60's muscle car, we are here to help design and build the engine combination to match you with your vehicle. Please browse our engine combinations listed below.

     Pro-formance Unlimited is best known for our precision custom designs. From that special built stroker engine to that turn-key drop in ready crate engine, we strive to build custom engines at an affordable price. Take a look at our crate engine videos. I guarantee we have the best engines on the World Wide Web. Give us a call today and ask for Doug, Steve, or Paul and we will be happy to answer any of your questions.

Custom Fully Dressed Chevy Engine

 

 

Mild Performance Engines:
      In This Category These Engines Will Give You Good Performance And Significant Power For Your Driving Pleasure, And Will Still Allow You To Use All Of Your Power Accessories. These Engines Will Interchange With Very Little Or No Up Grades To Present Vehicle Without The Maintenance And Headaches. "Carburetor, And OEM Computer Friendly"

     In Our Mild-Street Performance Category There Are Limitations To The Engines You Can Achieve (Compression Ratios Are From 8.0:1 To 9.5:1) Camshaft Will Have Nice Idle With That Traditional Muscle Car Sound " Good Low End To Mid End Response." (Cam Duration @.050 Are 195-225) ( Horse Power Range From Stock HP To 350 HP)

↓Turn-Key Crate Engine Packages Click Below For More Details↓
350  270HP
 Polished Engine Package
350 Chevy
Edelbrock Aluminum Heads
   350  295 HP
 Polished Engine Package
350 Chevy Engine
Edelbrock Aluminum Heads
 Full Roller Engine		   350  320HP

Cast Iron Heads
         
350  335HP

Cast Iron Heads
Full Roller Engine		  
350  350HP
Cast Iron Heads
Rat Rod Style 		  327 375HP
 327 Chevy Engine
Aluminum Heads
         
    383 Stroker 400HP
 383 Chevy Stroker 360HP
New Design
Aluminum Heads
Full Roller Engine		    

 

 

Super Street Performance Engines:
      In This Category These Engines Can Be Used For Both Street And Strip Applications.  Most Are Equipped With Lower Manifold Vacuum And Will Still Work With Power Accessories.

     In Our Super-Street Performance Category There Are Limitations To The Engines You Can Achieve (Compression Ratios Are From 9.0:1 to 10.4:1) Cam Shaft Will Have Fair Idle With That Loopy Sound.  "Engine Will Be Good Throughout The RPM Range." (Cam Duration @.050 Are 225-240) ( Horse Power Range From 350 HP To 450 HP)

↓Turn-Key Crate Engine Packages Click Below For More Details↓
350  375HP

Aluminum Heads
   Engine Design
350  420 HP

Aluminum Heads
Full Roller Engine		   350  440HP
Aluminum Heads
Full Roller Engine
         
350 475HP
Aluminum Heads
With Dual Quad Edelbrock		   383 450HP Stroker
Aluminum Heads
Full Roller Engine		   454 450HP

Cast Iron Heads
Full Roller Engine
         

 

 

Extreme Performance Engines:
      This Category Is Where The Real Horsepower Is Made.  The Engines In This Section Are For Serious Street/Strip/Oval Track Racing Applications.  All Engines Will Have High Compression Ratios, Rough Idle And A Lower Manifold Vacuum.  Power Accessories May Require Vacuum Canister Or Pump.

     In Our Extreme-Street Performance Category There Are Limitations To The Engines You Can Achieve (Compression Ratios Are From 10.0:1 To 12.0:1) Cam Shaft Will Have A Rough  Idle With A Nice Choppy Sound " Good Low End To Mid End Response." (Cam Duration @.050 Are 240-297) ( Horse Power Range From 475 HP And Up)

↓Turn-Key Crate Engine Packages Click Below For More Details↓
383 475HP Stroker

Dart Aluminum Heads
Full Roller Engine
   383 500HP Stroker

Dart Aluminum Heads
Fully Forged Bottom End
Hydraulic Roller		   383 510HP Stroker
Dart Aluminum Heads
Full Forged Bottom End
Mechanical Roller
         
Engine Design
427 Small Block
427 SBC Crate Engine
Dart Aluminum Heads
Full Forged Bottom End		  
454 550HP
Edelbrock Aluminum Heads
  
502 600HP

Dart Aluminum Heads
Full Roller Engine
         
540 630HP Stroker
Dart Aluminum Heads
Full Roller Engine		      Forced Induction Engines
Supercharged &
Turbo Charged

 

 

 

     
     As most Chevy enthusiasts know, the '55 Chevy made a huge impact on the automotive market when it showed up, and much of that impact came from the all-new 265-inch V-8 engine. An engineering milestone, the small-block almost instantly changed the poky image that Chevrolet had earned with its Stove bolt six. The new V-8 was peppy, compact, and, unlike competitors' V-8 power plants, it was light. It became known as the mouse motor, made big strides in its first few years. As most Chevy enthusiasts know, the '55 Chevy made a huge impact on the automotive market when it showed up.

     A new generation of big-block V-8s made a big impact in the '60s as well. The 396 made its debut in 1965, and was a standout performer in Corvette trim, pumping out 425 hp. A 375-horse version made it into a select few '65 Chevelle's (Z-16s), and by '66 the SS396 package was a big seller in the Chevelle’s line. A larger, 427-inch big-block added more heat to the Corvette that year, paving the way for the legendary L88 the following few years. The big-block eventually grew to 454 cubic inches, and by 1970 cranked out 450 hp in LS6 trim.

     Throughout the '60s the small-block V-8 really came into their own. Fuel-injected 327s making up to 360 hp were highlights of the next generation of Corvettes, the Sting Rays. Carbureted 327s found their way into the '65-67 Nova SS's. The '66 Nova SS, when equipped with the available 350hp (L79) version of the 327 "Turbo-Fire" V-8, was one of the hottest performers in the compact class. In 1967, the most popular configuration of the small-block V-8, the 350, made its debut. It found a welcome home in the newly introduced Chevrolet Camaro.

     Of course, a new generation of big-block V-8s made a big impact in the '60s as well. The 396 made its debut in 1965, and was a standout performer in Corvette trim, pumping out 425 hp. A 375-horse version made it into a select few '65 Chevelle's (Z-16s), and by '66 the SS396 package was a big seller in the Chevelle’s line. A larger, 427-inch big-block added more heat to the 'Corvette that year, paving the way for the legendary L88 the following few years. The big-block eventually grew to 454 cubic inches, and by 1970 cranked out 450 hp in LS6 trim.

     Today 38 years after introduction the small-block is the most popular engine in the enthusiast market with the vast array of performance parts available to turn them into a mild 325 horse power to a wild tire smoking stroker engine with 510 horse power. The big-block Chevy or the rat motor as it was referred to in the early hot roding became the standard for brute power for the serious street machine to all out competition racing.

     If you are restoring your early Chevy we can upgrade the horse power and still keep it looking original. Please call us for details.
         
     Whether your vehicle is a Corvette, Camaro,  Nova, Chevelle, or just and early 60's muscle car here at Pro-formance Unlimited we are here to help design and build the performance engine that best suits your vehicles needs. Please browse our performance crate engine combinations listed below or custom design one of your own. Pro-formance 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 we will be happy to answer any of your questions

 

 

Chevrolet Muscle Car OEM HP Statistics

Year Cubic Inch HP/ Torque Year Cubic Inch HP/ Torque
1964 409 340/420 1968 427 385/460
1964 409 400/425 1968 427 390/460
1964 409 425/425 1968 427 400/460
1965 327 350/360 1968 427 435/460
1965 396 325/410 1969 350 300/380
1965 396 425/415 1969 350 350/380
1965 409 340/420 1969 396 325/410
1965 409 400/425 1969 396 350/415
1966 327 350/360 1969 396 375/415
1966 396 325/410 1969 427 L88 430/450
1966 396 360/440 1969 427 335/470
1966 396 375/415 1969 427 390/460
1966 427 390/470 1969 427 400/460
1966 427 425/460 1969 427 435/460
1967 327 350/360 1969 427 425/460
1967 396 325/410 1970 402 350/415
1967 396 350/415 1970 402 375/415
1967 396 375/415 1970 454 360/500
1967 427 390/460 1970 454 390/500
1967 427 400/460 1970 454 450/500
1967 427 435/460 1971 350 330/360
1968 327 300/360 1971 402 300/400
1968 327 350/360 1971 454 365/465
1968 396 325/410 1971 454 425/475
1968 396 350/415 1972 350 255/280
1968 396 375/415 1972 402 240/390
1968 427 L88 430/450 1972 454 270/390

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

International +1-732-462-7283

Fax 1-732-462-7202

E-Mail Us:  info@Pro-formanceunlimited.com

 

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