3/4" Open Center Square Carburetor Adapter Plate 4BBL Square Bore Manifold 9132 Upgrade your engine setup with this high-quality 3/4" Open Carburetor Adapter Plate. Designed for use with 4-barrel carburetors on Quadrajet base manifolds, this adapter ensures optimal performance and a seamless installation. Crafted from durable aluminum alloy with a sand-blast finish, it is built to withstand the rigors of engine use while improving air-fuel distribution. Features Durable Construction: Made from high-strength aluminum alloy for longevity and reliable performance. Optimized Design: Open center design promotes better air-fuel distribution for enhanced engine efficiency. .