head casting 3835409 is used in part # 3835408 for 1949 engines and listed as replacement head for all engines 41-49 216 and 235 engines as of 1949, in 1950 a newer replacement head is listed in place.
This head has non-45 degree exhaust valves, compatible if swapping whole head assembly w/ valves
This head has 14 mm spark plugs, but may have been machined for 10 mm spark plugs in early years, not sure.
