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Holley EFI



Part # 300-631BK
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The P/N 300-631 & 300-631BK Lo-Ram billet aluminum plenum tops are designed as part of the Holley LS Ultra Lo-Ram EFI intake manifold kits. It is commonly known billet is the best. The strength and rigidity of these components is impervious to cracking and further resists any vibration and harmonics. These 3D CNC machined pieces are cut from a solid block of billet and then anodized. Take your Ultra Lo-Ram to another lever with Holley billet components.


  • Machined billet construction
  • Clear/black anodized for long-term protection from elements and fuels
  • Works with all Ultra Lo-Ram bases (300-602, 300-602BK, 300-603, 300-603BK)
  • Holley Ultra Lo-Ram Plenum top can be custom machined for a standard “large” 6-1/8” x 3-1/8” burst panel (SFI approved burst panels, burst panel frame sets, and gaskets may be purchased from various manufacturers such as Allstar Performance or Specialty F
  • Modular Lo-Ram design allows user customization for your induction system
  • Flange seal o-ring cord and the mounting fasteners are included in the kit
  • Includes hardware

About Holley EFI

Holley is the new standard in EFI! Whether you're engine swapping your classic street car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever!

BrandHolley EFI
Burst Panel CompatibleYes
Emission Code3
EngineGM LS1/LS2/LS6
Fuel System TypeEFI
Manifold TypeUltra Lo-Ram
Product TypeIntake Manifold Top
WarrantyLimited 90 Day
Part Number300-631BK

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only 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

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
Limited 90 Day: See Details

*Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

Some parts are not legal for use in California or other states with similar regulations.