Exacct 1937 61 cu in small port replica Knucklehead cylinder head set ( blank set ) 1937 only  feature original cast . Head set include valve seats, Manifold screw and primer plug boss plug installed. Rocker brackets has a 90 Dergee V chape and a longer reinforcement as original. The heads have all fins like original and can be completed with open Rocker cups only!
Brand is manufactured by Motortechnic Mfg. in Germany
NOTE: 
Head are casted with numbers 119-35 front head 119-352 rear head and hall mark like original. Uses 1-3/8" large hex 18mm plugs. Valve seats and 61" intake nipples are installed. Late cups and tins 1941-1947 will not fit.
The mold was taken from original heads, you can not tell from the original