Big Block Chevrolet EFI-R Manifold Kit- 3.00-inch, Gray

Part # 300-807
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This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

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The Hilborn EFI-R injector manifold kits combine the technology of Electronic Fuel Injection with the racing born performance and aggressive looks of Individual-Runner engine induction. The engine valley covers are sold separate to allow the customer to choose the correct valley cover kit based on the engine deck-height, 300-802 - Std. 9.800-inch height or 300-803 - Tall 10.200-inch.


  • Fits OE & aftermarket Big Block Chevy engines which have OE standard or tall block deck heights. 300-802 for standard 9.800-inch height, 300-803 for tall 10.200-inch height
  • Hilborn high-quality heat-treated aluminum valley cover castings, ceramic coated a beautiful dark gray
  • The injector manifold throttle cross-over link appropriate to the engine deck height and throttle shaft center to center distance is included in the valley cover kit
  • The machined valley cover provides two -10AN O-ring sealed ports, these ports can be used for crankcase breathers, installation of a dry sump oil scavenge pick-up, or an oil fill location
  • The Hilborn Big Block Chevy valley covers are intended for use with a set of Hilborn EFI-R injection manifolds but these valley covers could also be used as part of a custom induction system being built
  • Ram Tubes and Lifter Valley Covers sold separately
  • Large 3.00-inch butterflies provide maximum airflow and are recommended for maximum performance or race only applications.
  • Street/strip applications should consider the 2-7/16 PN 300-800 or 2-5/8 butterfly size PN 300-801
  • Some applications may require changes to throttle linkage ratios for increased throttle tip in control
  • Converging tract design provides increased air speed for maximum cylinder fill
  • High injector placement helps to optimize fuel conditioning for a dramatic increase in engine acceleration rate

About Hilborn

Following World War II, Stuart Hilborn designed and built the first constant flow mechanical fuel injector. Since then, Hilborn Fuel Injection has continuously revised and improved its fuel injection systems for both street and race applications.

Brand Hilborn
Emission Code3
Product TypeIntake Manifold
Part Number300-807

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

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

*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.