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Holley EFI

Holley 300-673BK Ultra Lo-Ram Manifold Base & Fuel Dual Single Injector Black

Part # 300-673BK Be the first to write a review

Compatible with GM LS Gen III and IV engines equipped with LS3/L92 Heads

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Holley 300-673BK Ultra Lo-Ram Manifold Base & Fuel Dual Single Injector Black

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This Holley Ultra Low Ram manifold base fits Gen III/IV engine with original or aftermarket LS3/L92 cylinder heads. It is designed forced induction (supercharged or turbocharged) engine applications with peak power at 7000-8000 rpm. Designed with a lower overall height to fit under a stock or mildly modified hood in the front feed configuration. The modular construction also makes it suitable for fabrication of special throttle body adapters or inlet ducts for custom installations. It includes dual injector, dual passage high flow fuel rails with 3/4-16 (8 AN) O-ring ports with two sets of mounting brackets that allow the use of standard tall injectors or short Pico or LS7 injectors. Black powercoated finish, an as-cast finish is also available, 300-673. And a single injector version is also available, #300-672BK. Mounting hardware is included.

Features:

  • Designed for Gen III/IV engines with OE or aftermarket LS3/L92 heads
  • Maximum performance for supercharged or turbocharged applications with peak power at 7000-8000 rpm
  • Low overall height to fit under stock or mildly modified hood in a front feed configuration.
  • Modular design suitable for fabrication of special throttle body adapter or inlet ducts for custom applications
  • High volume, dual injector, dual passage fuel rails with 3/4-16 (8 AN) O-ring ports and sixteen (2 per cylinder) injector configurations. Two sets of brackets allow use of standard tall injectors or short Pico LS7 style injectors. Mounting hardware includ
Brand Holley EFI
Emission Code3
Product TypeIntake Manifolds
UPC090127100868
Manufacturer Part Number300-673BK
Part Number300-673BK
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 #300-673BK
Manifold base height- 5.67"

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      *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.