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 our system. The plenum tops are constructed of cast aluminum.

Features

• Single plane design with isolated plenum for cooler charge air temperatures
• 4150 square bore mounting flange
• Power band: 2500-7500 RPM
• Height: front 5.58‚Äù, rear 6.40‚Äù
• Port size: 1.82‚Äù height, 1.04‚Äù width
• Extra material allows for porting to 2.00‚Äù height, 1.20‚Äù width
• Anodized aluminum fuel rails with laser-etched logo (EFI model) 6AN
• Includes fuel rail mounting brackets in two sizes for more options in fuel injectors (EFI Model)
• Accessory ports under the carburetor in 1/8 NPT, 1/4 NPT and 3/8 NPT sizes