Skip to main content
9
Images
Videos
Holley EFI

Holley 300-684BK Ultra Lo-Ram Manifold Kit with Burst Panel Dual Injector Black

Part # 300-684BK Be the first to write a review

Compatible with GM LS Gen III and IV engines equipped with LS3/LS92 Heads

Read More

Holley 300-684BK Ultra Lo-Ram Manifold Kit with Burst Panel Dual Injector Black

Not Available

Designed for boosted combinations with hood clearance in mind.

This intake will work with OE or aftermarket LS3/L92 cylinder heads. The Ultra Lo-Ram intake manifolds are designed for forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm depending on the application. Plenum top has a machine flange for the use of a 6-1/8" x 3-1/8" burst panel (not included). The Ultra Lo-Ram plenum flange has a 105 mm opening to work with Holley throttle body part number 112-581 or similar models. Very low overall height to fit under stock or mildly modified hoods. Even clears the low C6 Corvette hoodline. Modular design allows fabrication of special throttle body adapters or inlet ducts for custom installations. Includes high blow fuel rails with 3/4-16 O-ring ports (8 AN). Rail kit comes with two sets of brackets, a set for long (usually standard length) fuel injectors and a set for short (such as Pico, or LS7) fuel injectors. Designed for dual injector applications. For single injector applications use #300-682. Mounting hardware and gaskets are included.

Features:

  • Designed for Gen III/IV engines with LS3/LS92 head, OE or aftermarket
  • Maximum performance for supercharged or turbocharged applications with peak power at 7000-8000 rpm. Plenum top is machined to accept a 6-1/8" x 3-1/8" burst panel (not included)
  • Accepts 105mm throttle bodies like Holley 112-581
  • Low height to fit under a stock or mildly modified hood in the front- Clears C6 Corvette cowls and hoods without modification
  • High volume fuel rails for dual (2 per cylinder) injector configurations. Two set of brackets allow use of standard tall injectors or short Pico LS7 style injectors.Mounting hardware included with 3/4-16 O-ring ports (8 AN)and mounting hardware included
Brand Holley EFI
Emission Code3
Product TypeIntake Manifolds
UPC090127100981
Manufacturer Part Number300-684BK
Part Number300-684BK
3

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
Instructions for Part #300-684BK
Height with Front Feed Plenum Configuration w/105mm Throttle Body Adapter - 7.36"

Have a question about this product?

    Load More
    Reviews

      Your Review

      *Free Shipping & Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

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