▁App lications ▁ ▁The ▁most ▁popular ▁inc arn ations ▁of ▁the ▁series ▁ 7 1 ▁engine ▁as ▁used ▁for ▁highway ▁vehicle ▁applications ▁included ▁the ▁inline ▁ 6 - 7 1 , ▁the ▁V - block ▁ 6 V - 7 1 ▁( both ▁widely ▁used ▁in ▁trans it ▁bus es ) ▁and ▁the ▁ 8 V - 7 1 ▁V - 8 . ▁In ▁addition ▁to ▁motor co ach ▁prop ulsion , ▁both ▁inline ▁and ▁V ▁types ▁have ▁found ▁extensive ▁usage ▁in ▁tr uck s , ▁fire ▁appar atus , ▁motor ▁homes , ▁construction ▁and ▁industrial ▁mach in ery , ▁a ▁few ▁farm ▁tra ctors , ▁commercial ▁fish ing ▁vessels , ▁and ▁military ▁vehicles ▁and ▁equipment . ▁ ▁The ▁ 7 1 ▁series ▁is ▁very ▁popular ▁in ▁marine ▁applications , ▁not ▁only ▁as ▁a ▁prop ulsion ▁engine ▁in ▁small ▁craft ▁( G ray ▁Marine ▁ 6 - 7 1 ) ▁but ▁as ▁auxili ary ▁power ▁to ▁drive ▁gener ators , ▁win ches ▁and ▁other ▁heavy ▁ship board ▁mach in ery . ▁The ▁Detroit ▁inline ▁ 6 - 7 1 ▁engine , ▁in ▁all ▁of ▁its ▁variations , ▁was ▁also ▁available ▁as ▁a ▁' pan ca ke ▁engine ' ▁( here ▁vari ably ▁called ▁either ▁ 6 L - 7 1 ▁or ▁ 6 N - 7 1 ) ▁for ▁horizontal ▁( under floor ) ▁mount ▁applications , ▁such ▁as ▁on ▁larger ▁Crown ▁and ▁Gill ig ▁school ▁bus es ▁and ▁art ic ulated ▁pull er ▁trans it ▁bus es ▁( such ▁as ▁the ▁Crown