This is a Brand New 350 cubic inch small block Chevy deluxe crate engine that pumps out an honest 355 horsepower. Imagine an aluminum head small block Chevy 350 that makes 355 honest horsepower. What if it had a street roller camshaft, 4-bolt main block, undercut rolled billet crankshaft, high silicone pistons and strong PM connecting rods? The ZZ4 is the evolution of the popular ZZ series of small blocks that power thousands of street rods, hot street cars, circle track racers and drag racers. With over 400 ft-lbs. of torque, the ZZ4 is the best way to put an aluminum head, roller cam, high performance small block between your favorite fenders. The aluminum angle plug cylinder heads have screw-in rocker studs, 1.94" intake valves and 1.50" exhaust valves and 58cc combustion chambers that yield a crisp and responsive 10.0 to 1 compression ratio. Also included are lightweight valve spring retainers that weight half as much as our previous design.
The valve seats are radiused and we have included valve stem seals to keep the oil where it belongs. To compliment the cylinder head design, we've incorporated a steel roller tappet camshaft with .474" intake and .510" exhaust valve lift. The combination makes 355 horsepower at 5250 RPM and has that great sounding muscle car idle, with just enough lope to let people know this is no station wagon engine. Also included with the ZZ4 is an HEI distributor with an ignition timing advance curve developed for performance, a dual plane aluminum intake manifold that accepts your spread bore or square bore carburetor, an 8" high-rpm harmonic balancer, 12.75" automatic transmission flex plate and a cast iron water pump. It even has the spark plugs in it from when it was test fired at the factory for quality control checks. With a long history of successes in circle track and drag racing as well as street rods and other performance applications, the ZZ4 may just be the bullet for your next project.
This engine is not intended for marine use, and should only be used in 1973 and earlier pre-emissions street vehicles or for off-highway use only. This is a bolt-in replacement for most 265-400 cubic inch small block Chevy V8's.
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