20-4097C KPMI, intake/exhaust valve guide. Cast iron. +.004"

For the ultimate in durability and wear resistance on a classic Knucklehead, Kibblewhite cast iron valve guides are the industry standard. These intake and exhaust guides are machined to a +.004 inch oversize, making them ideal for cylinder heads that have seen significant service and require a fresh bore for a tight, secure fit. Cast iron has been the preferred material since the dawn of the piston engine because it holds up exceptionally well under the extreme heat and stress of long-distance touring. These guides fit 1936 to 1947 Knucklehead models and provide the reliable foundation your valvetrain needs to maintain proper valve seating and efficient heat dissipation.