3-5/16" / 3-7/16" bore. With 1mm (.040") Blue PTFE coated paper 3-5/16" cylinder head gaskets and 0.75mm (.030") reinforced fiber cylinder base gaskets. Includes all required gaskets and seals for a top end rebuild. OEM replacement reference 17034-38 (55-48)
Fits: > 38-47 E, EL (1000cc / 61") and F, FL (1200cc / 74") Knucklehead (NU)
