Chevrolet Performance 12366573 - Intake Manifold, Vortec Head Design

• Designed for 283-400-cubic-inch engines using Vortec cylinder heads P/N 12558060, P/N 19300956, P/N 19300955, P/N 19331470, or P/N 19331472 • Has 4-bolts per side to attach it to these cylinder heads • Aluminum high-rise design maximizes horsepower and delivers a broad torque curve • Accepts a square-bore 4150-style carburetor and includes externally plumbed hot water crossover passage • Use manifold gasket P/N 89017465 and eight attachment bolts, P/N 12550027