This cast aluminum side mount plenum top resembles the older Ford EFI manifolds, mounting the throttle body on the side of a Hi-Ram base for easier fabrication in boosted applications or a different look than a top-mounted throttle body.
Specifications:
- Construction: Cast Aluminum
- Finish: Silver/Natural
- Inlet Size: 105mm
- Compatibility: GM style throttle body pattern
- Fuel System Type: EFI
- Type of Component: Manifold Top
- Mounts to: Existing Holley Hi-Ram manifold bases
- Part Number: 300-302
Verified to fit under a Cervinis 2.5" cowl hood on 1979-1993 Mustangs with 351W & 302W Hi-Ram bases, when using motor mounts that retain stock engine location.
FAQ
What throttle body pattern does the 300-302 use?
A GM-style pattern, 105mm inlet size.
What does it mount to?
Existing Holley Hi-Ram manifold bases, as a side-entry plenum top.
Will it clear a Cervinis cowl hood?
Yes, it's been verified to fit under a Cervinis 2.5" cowl hood on 1979-1993 Mustangs with 351W/302W Hi-Ram bases, using motor mounts that retain stock engine location.

