50mm TBI throttle body to 4 barrel intake manifold adapter fits Chevy GM Holley

Adapts a 2"or 50mm bore small block TBI (Throttle body injection) to a Holley pattern 4 barrel manifold. Bolt pattern is 5.16 x 5.620 1' thick. Bores are angled to streamline the flow from the wider throttle body to narrow 4bl intake.