Fits Holley Hi-Ram Manifolds - Holley has launched new black ceramic coated plenum tops to match our Hi-Ram manifold bases!

They are available in the dual 4150 throttle body pattern or in a full blank top so that you can design your system. The plenum tops are constructed of cast aluminum.

Features:
Fits Holley Hi-Ram Manifolds - Holley has launched new black ceramic coated plenum tops to match our Hi-Ram manifold bases!

They are available in the dual 4150 throttle body pattern or in a full blank top so that you can design your system. The plenum tops are constructed of cast aluminum.