3836850 

http://www.stovebolt.com/truck/casting.html


1954-1955 261, 1st Series, 3836850


1955-1957 261, truck, 3836850


1958 261, Stellite valves 3836850


1959 261, side mount, 3836850


1960-1962 261, Front Center Mount, 3836850