K4 Series Carburetors


Our K4 series Carburetors follows along the same lines as the Rated “R” Carburetor.  This carb is made for a cast aluminum center section. As always, these are custom calibrated per application.


  • Cast main body tumble finished (dominator) and shiny aluminum or billet for our 4150 and 4500 designs
  • Custom boosters per application
  • IRD Billet base plate for our 4150 designs
  • Adjustable throttle linkage 4150/4500
  • Cast aluminum fuel bowls with big sight windows
  • IRD K4 billet metering blocks (2 or 3 circuit design per application)
  • Adjustable air bleeds
  • High flow needle and seat custom to your specs
  • Compatible with Gas, E85 andAlcohol
  • All carbs can be hard anodized for an extra $200.00 recommended for E85 and alcohol combinations