The bore may include a first radial inner surface at the first lobe member and {TAIL ~ a second radial inner surface} at {HEAD ~ the second lobe member} 
The bore may include a first radial inner surface at the first lobe member and { TAIL ~ a second radial inner surface } at { HEAD ~ the second lobe member }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD