Written by Jeremy Horelick
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If you demand high performance from a lighter-weight engine, your search ends with the ZZ4. Continuing its evolution of the ZZ line, GM delivers the power that drivers expect from a ZZ, but with an all-aluminum head for a light design. Never fear--GM still incorporates a steel roller camshaft, four-bolt main block, and tough silicon pistons to give the ZZ4 plenty of durability.

The result of all this innovation is a small block engine that's well suited to drag and circle-track racing, even if that's not your intention. The ZZ4 derives its power from an impressive 10:1 compression ratio, which pays off in 400 foot-pounds of torque. Add to that its 350 horsepower, and you've got a more-than-adequate small-block rival to the heftier big-block Chevy engines.

You Get More with a ZZ4

Included with your ZZ4 package are a host of parts to get you up and running quickly. An HEI distributor, dual-plane intake manifold, torsional damper, water pump, and auto-trans flex plate round out the package, so there's no need to shop for aftermarket parts from another dealer. Simply hoist your ZZ4 into your pre-1975 street-rod, and you're ready to roll.

If you're planning to buy a ZZ4 from your local parts vendor, you may wish to consider pricing out alternatives online. Even if you don't end up purchasing your crate engine over the Web, you can typically scour a much larger range of dealers and at least find more competitive rates. Then head down to your supplier in person and check out their showroom or warehouse before you buy.

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