In a second embodiment, {HEAD ~ the fuel injector} is positioned between the air delivery passage and {TAIL ~ the side} of the engine 
In a second embodiment , { HEAD ~ the fuel injector } is positioned between the air delivery passage and { TAIL ~ the side } of the engine
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH