▁F W B ▁version ▁of ▁Cov entry ▁Cl im ax ▁F WA ▁( which ▁was ▁an ▁autom ot ive ▁conversion ▁of ▁a ▁fire ▁p ump ▁engine ) ▁with ▁a ▁compact ▁SO HC ▁cyl inder ▁head . ▁ ▁In ▁contrast , ▁the ▁F PF ▁used ▁on ▁Lot us ▁ 1 5 ▁were ▁pure ▁racing ▁engines ▁with ▁a ▁g ear - dri ven ▁DO HC ▁head ▁and ▁dry ▁sum p . ▁▁ 1 9 5 6 ▁F PF ▁ 1 4 7 5 cc ▁ 4 ▁cyl ▁ 3 . 2 0 ▁x ▁ 2 . 8 0 " ▁ 1 4 1   b hp ▁( 1 0 5   k W ) ▁at ▁ 7 3 0 0 ▁r pm ▁ 1 9 5 7 ▁F PF ▁ 1 9 6 4 cc ▁ 4 ▁cyl ▁ 3 . 4 0 ▁x ▁ 3 . 3 0 " ▁ 1 7 5   b hp ▁( 1 3 0   k W ) ▁at ▁ 6 5 0 0 ▁r pm ▁ 1 9 5 8 ▁F PF ▁ 2 2 0 7 cc ▁ 4 ▁cyl ▁ 3 . 5 0 ▁x ▁ 3 . 5 0 " ▁Sm aller ▁block ▁ 1 9 5 8 ▁F PF ▁ 2 4 6 7 cc ▁ 4 ▁cyl ▁ 3 . 7 0 ▁x ▁ 3 . 5 0 " ▁ 2 2 0   b hp ▁( 1 6 0   k W ) ▁at ▁ 6 5 0 0 ▁r pm