ZZ 572/720R

720 Horsepower - Special Performance
Part # 12498827

The ultimate beast!
When our GM Performance Parts engineers sat down and designed the ZZ572/720R, we told them to build something nasty. We think they accomplished that mission with a resounding 720 horsepower and 685 lb.-ft. of torque –creating at the same time the most powerful big-block crate engine ever offered by GM Performance Parts.
We took the ultra-popular ZZ572/620 pump gas street engine added 12:1 compression pistons, a hotter camshaft, and our rectangular-port aluminum Bowtie heads with stiffer valve springs to work with the new cam. The block is the Gen VI tall-deck Bowtie block which was designed for the 572" application. The solid roller camshaft is a .714" lift magic maker that aggressively feeds the air/fuel mixture into the hungry, high-squeeze, stroker big-block.
The ZZ572/720R is rated at 720 horsepower at 6250 rpm and 685 lb.-ft. of gut-wrenching torque at 4500 rpm. The short block is built with a 4340 forged steel crankshaft, shot-peened forged steel rods, forged aluminum pistons with full-floating wrist pins, stiff dual valve springs, and a louvered oiling windage tray. Our Deluxe ZZ572/720R ships with a 1090-cfm Demon four-barrel carburetor, tall-deck single-plane intake manifold, HEI distributor, aluminum short-style water pump, and 8 mm spark plug wires. Distinctive "572" cast aluminum valve covers complete the package. All you need is a GM Performance Parts lightweight starter to fire it up!

Performance ZZ383 - 425 Horsepower

425 Horsepower - Special Performance
Part # 12498772

Big-block-style power from a small-block engine! If you're looking for a small-block Chevy that makes big-block power, we've got the engine for you! For the ultimate GM Performance Parts small-block crate engine, choose the ZZ383 – a combination of Fast Burn aluminum performance heads and a 383" stroker small-block that can add up to 425 horsepower and 449 lb.-ft. of torque. A carefully engineered balance of torque-producing bottom-end power and horsepower-inducing Fast Burn cylinder heads combine for the ZZ383/425's stellar performance statistics. The Fast Burn heads have large 2.00"/1.55" valves and specially designed chambers that draw in lots of air and fuel, burning the mixture quickly and completely. It's a combination that generates great mid- and high-rpm power, which, when combined with the 383 cubic inch displacement, creates an awesome all-around performer. The ZZ383 has a specially modified engine block and 3.80"-stroke crankshaft, which produce 383 cubic inches of pure performance. The reciprocating assembly is comprised of heavy-duty components including a 4340, nitrided, and induction-hardened forged crankshaft, and unique, heavy-duty powdered metal rods. It's 425 horses of bulletproof performance. With the ZZ383/425, you get the power of a big-block with the size and weight of an aluminum-headed small-block. If you've never driven a car with a stroked small-block and the top end components to support it, now is your chance!

Performance 350 C.I. Engine - 300 Horsepower

300 Horsepower - Special Performance
Part # 1235545

This 300 hp special performance engine assembly is designed for street use in your 1968 or earlier car or truck. This 9.1:1 compression performance engine is the perfect engine for that old muscle car feeling. The block is the same four-bolt main design with one piece rear as used in the 350 High Output Engine. The 64 cc cast iron cylinder heads are non swirl design for greater performance. This Engine also includes "chrome" timing cover and rocker covers. the intake manifold, distributor, flywheel, balancer, water pump and exhaust manifolds are not included in this engine assembly.

ZZ4 High Output 350 C.I. Engine

355 Horsepower - Street and Race Performance - Part # 12499712

An aluminum-headed 350 that makes 355 horses! As far as crate engines go, this one is a winner. The ZZ4 350 Turn-Key crate engine has been one of our most popular high performance crate engines since we started GM Performance Parts. Its legendary status is based on an incredible performance level that is stone cold reliable. We've packed the ZZ4 350 crate engine with a forged steel crankshaft, hypereutectic pistons, hydraulic roller camshaft and lifters, and aluminum cylinder heads. The ZZ4's Corvette-derived high-performance heads feature high velocity intake runners and D-shaped exhaust ports to promote efficient and unobstructed flow through the engine – providing strong power and torque at all RPM levels. The ZZ4 350 is delivered with an aluminum dual-plane intake manifold, HEI distributor, cast iron water pump, damper, and flexplate. Our Turn-Key ZZ4 350 crate engine also ships with all the parts you need to get it running. That includes an accessory drive package, fuel pump, chrome air cleaner kit, Holley 750-cfm carburetor, starter, and spark plug wires. The ZZ4 comes to you with a full 355 horsepower and 405 lb.-ft. of torque. With its high level of performance and durability, it could very well be the perfect crate engine – able to meet the needs of car builders from all phases of the motorsports world.