Does anybody make after market engines or maybe just the faces for the Blackhawk in 1/35th?
No one does the full engines that I know of. If by faces, you mean the intake fans, Cobra Company does a set of 1/35 one piece, seamless, intakes with fans in them that look really good. CC is currently not taking orders though due to an illness. Hopefully they will be back up and running soon. They have lots a of great detail and conversion sets for Blackhawks.