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Hilborn 8 Stack EFI-R Manifold Kit for LS3 / L92 Rectangle Port

Part numbers: 
300-816 : 2 3/16" Bore Throttle Bodies
300-818 : 2 1/2" Bore Throttle Bodies

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 LS GEN IV engine valley cover is sold separately to provide a complete classic Hilborn package. Hilborn, the original fuel injection for American racing and land-speed record cars.


  • Iconic Hilborn styling paired with modern EFI electronics provides the best of both worlds for your Hot Rod, Racecar, Drift Machine or Boat!
  • All new manifold tooling yields high-quality, heat-treated castings and provides the ultimate appearance with an as-cast satin finish
  • LS3 Hilborn EFI-R injector manifolds are available in throttle bore sizes of 2-3/16” for street & hot-rod and 2-1/2” for high-RPM & horsepower applications
  • 17-4 stainless steel split throttle shafts allow easier cylinder to cylinder throttle opening balance adjustment
  • -8AN hard coat black anodized EFI fuel rails with included end adapters fittings stand-up to methanol & ethanol fuels and provide the capacity needed for racing applications
  • Manifold vacuum plumbing and distribution block that mounts beautifully on the Hilborn 300-819 valley cover is contained in the 300-816 & 300-818 kits providing a proper MAP sensor signal
  • Kits are complete providing mounting hardware, o-ring mounting flange seals, and required throttle linkage & levers
  • Valley cover design includes an OE oil pressure sensor port which also may be fitted with adapter fitting for mechanical oil pressure gauges. Valley cover also seals-off the LS Gen IV DOD oil passages
  • Ram tube sets, 2-3/16” Plated Steel and 2-1/2” Aluminum are sold separately in lengths of 8 and 12-inch
  • We recommend Terminator EFI ECU PN 550-905T (no electronic transmission control) or 550-918T (for use with Electronic Overdrive Automatic transmissions) to be used with this kit