Holley Hi-Ram Intake Plenum Top Only - 2 x 4500 (2.5" bore) - GM LT1

LT1 Hi-Ram, Plenum Top Only, 2 x 4500, 2.5in Bore

PART# 300-239

$178.95   Suggested Retail
$160.95   Your Price
Estimated shipping date: 11/01/2017
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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”
  • O-Ring Seals for Plenum Top
  • Easy Assembly w/ Top Mounted Screws on Plenum Top (all except front 2 screws)


BrandHolley EFI
Emission Code3
EngineGM Gen V LT1
Manifold TypeManifold
RPM Power Band3500-8000+
Type of ComponentManifold Top
Part Number300-239


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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