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Pro-Formance Unlimited takes great pride in all our engines. Whether your vehicle is a Corvette, Camaro, Nova, Chevelle, or just and 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 Matt we will be happy to answer any of your questions.

choose chevy engine below

350 Chevy 320HP
Chevy 350 320HP

350 Chevy 335HP

350 335HP Full Roller Engine

327 Chevy With 375HP
327 Chevy Crate Engine

350 Chevy 425HP
350 Chevy 420HP Our Best Seller

 

383 Stroker With 400HP
Chevy 383-400hp

383 Stroker With 450HP

383 Chevy Stroker

427 SBC Stroker With 550HP
427 SBC Crate Engine
454 Chevy Big Block 550HP
454 Chevy Big Block Crate Engine
502 Big Block With 550HP
502 Chevy Big Block Crate Engine

540  Big Block Stroker 630HP

 

 

 

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 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.

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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

*There Will Be a 25% Restocking Fee On All Canceled Custom Built Performance Engine Orders *

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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