GM Performance Parts' ZZ4 intake manifolds are designed for use on all ZZ series 350 HO engines, but can be used on any small block Chevrolet through 1986. They're about .5 in. lower than an LT1 manifold, for better underhood clearance, and can mount either a standard-flange Holley 4-barrel or a spread bore Quadrajet. They develop the same power as the earlier high-rise design, plus they're set up to accommodate EGR, a hot-air choke, and all late model accessory brackets. Exhaust EGR ports currently blanked off. £80