ZZ5 350 Base

The next chapter in the •ZZê crate engine legacy Building on the strength and power of the legendary ZZ4 Small-Block, Chevrolet Performance engineers have upped the ante with a revised cylinder head design, new valvetrain components and more to create the all-new ZZ5 _ a 400-horsepower 350 with loads of low-end torque. In fact, the new ZZ5 produces at least 300 lb.-ft. of torque by only 1,500 rpm, for a thrilling feeling of immediate performance. The new, lightweight aluminum cylinder head casting is based on the proven Fast Burn design, with large intake runners and 2.00/1.55-inch valves. New beehive-style valve springs enable greater high-rpm performance and durability, as the egg-shaped springs have less reciprocating mass in motion, require less spring pressure for greater valve control and handle valvetrain stresses more efficiently.