Chevrolet Performance Parts 19433041 ZZ6 Base Crate Engine

Rated at 405 horsepower and 406 lb-ft of torque, this ZZ6 Base long block runs lightweight aluminum cylinder heads styled after the Fast Burn family, with large runners feeding 2.00/1.55-inch valves. Compression sits at 9.72:1 over a hydraulic roller camshaft, with a 4.000-inch bore and 3.480-inch stroke making up the 350-cubic-inch total.

Why the valve springs matter here

Beehive-style valve springs give this engine its reach into higher rpm: the egg-shaped coil carries less reciprocating mass, needs less seat pressure, and handles valvetrain stress more efficiently than an older round-spring design. That is what lets the ZZ6 pull air through those large runners as revs climb, with the roller cam specced at 208 degrees of intake duration, 221 on the exhaust, and matching .474/.510-inch lift.

What ships on the engine

As a Base kit, the intake manifold, distributor, water pump, and damper all arrive installed, along with a forged-steel crankshaft, powdered-metal connecting rods, and the distinctive racing-style valve covers, under a one-piece rear main seal. A carburetor, throttle body, air cleaner, spark plugs, spark plug wires, computer, and wiring harness are not included, so plan your induction and ignition separately. California buyers should check current engine-swap rules with the state's Bureau of Automotive Repairs before this goes into a registered vehicle.

Q: Does this Base kit include an intake manifold? Yes, along with the distributor, water pump, and damper, all installed.