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