This Hi-Ram plenum top only comes with a blank flange, designed to fit Holley Hi-Ram manifolds as a foundation for custom fabrication or EFI conversions.
Specifications:
- Manifold Type: Hi-Ram plenum top, blank flange
- Construction: Cast aluminum, satin finish
- RPM Power Band: 3,500-8,000+
- Height at Plenum Flange: 9.44"
- A-B Height (w/ carb style top): 12.10"
- Sealing: O-ring seals for plenum top
- Part Number: 300-208
Designed for use with Bosch-style EV-1 or GM LS7 fuel injectors on Hi-Ram intake manifolds with port EFI provisions.
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
What does the 300-208 include?
A Hi-Ram plenum top only, with a blank flange for custom fabrication.
What Hi-Ram manifolds does it fit?
Holley Hi-Ram manifolds using the modular removable-top design.
What injectors is it designed to accept?
Bosch-style EV-1 or GM LS7 fuel injectors when used with port EFI provisions.
Is this part street legal?
No. It's legal for sale and use only on Racing Use Only vehicles that are never registered or operated on the street.

