Holley Hi-Ram Intake Plenum Top Only, 2 x 4150 - GM LT1

GM Gen V LT1 Hi-Ram, Plenum Top Only, 2 x 4150

PART# 300-207

$178.95   Suggested Retail
$144.86   Holleydays Price
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Fits Holley Hi-Ram Manifolds - GM Gen V LT1 Only


  • Modular Design w/ Removable Top
  • A-B Height: 12.10” (w/ Carb Style Top - 2 x 4150 or 2 x 4500) – See Drawing
  • Height at Plenum Flange: 9.44”
  • Easy Assembly w/ Top Mounted Screws on Plenum Top (all except front 2 screws)
  • O-Ring Seals for Plenum Top


BrandHolley EFI
Emission Code3
EngineGM Gen V LT1
Product TypeManifold
Type of ComponentManifold Top
Part Number300-207


This part is legal for use on Uncontrolled (Non-Emissions Controlled) Vehicles or Racing Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

Racing Vehicles are vehicles that are used exclusively for racing or other forms of competition that are not registered and that may never be used on the street.

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