K4 series custom carburetors are designed with the nitrous/naturally aspirated racer in mind. From Mega Trucks, Super Cat Class Poker Run boats, to all out drag racing, this carburetor can handle whatever is thrown at it.
Made with a billet aluminum center section and custom calibrated for your racing application. Features include Billet construction for IRD’s 4150 and 4500 designs, custom boosters per application and more.
*Billet construction for 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
*Teflon bushing inserts for better throttle shaft sealing
*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 applications
Rated R carburetor is recommended for E85 and alcohol combinations and saltwater boat applications due to it’s corrosion resistant coating.