GM Performance Intake Manifold, Oval Port, Dual Plane, Aluminum, Natural, Square/Spread Bore, Chevy, Big Block, Oval Port (PART #GMP-12363420)

High-rise GM Performance oval port dual plane intake manifolds are the latest in dual plane design thinking and technology. They're intended for all big block Chevrolet 396-502 c.i.d. engines with either current oval port aluminum heads or 1975 and earlier large oval port iron heads. They're set up for a single 4-barrel and have dual bolt patterns on the carburetor flange. There is no provision for hot-air chokes, and they will not fit some Corvettes with limited hood clearance.