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The ZZ502 base engine, which boasts 4.47-inch bores and is stroked to 4.00-inch, comes with aluminum oval-port cylinder heads with generous 110cc combustion chambers. It's valvetrain features 2.25-inch intake and 1.88-inch exhaust valves to keep it breathing easy. The forged steel crankshaft is paired up with a hydraulic roller camshaft for solid performance. All you need to add is attitude, and an intake manifold, carburetor, water pump, distributor and plug wires. Everything but the attitude is available from your GM Performance Parts dealer. You can pick one up for $8,956.