Red 6 cylinder,small chamber 9 port part number cast into head 7420109.My '48 to HD master parts cattledog doesn't list it, but lists number 7420108 as being EH/HD 149.
Also Red 6 large chamber 9 port number 7429461, modified with bigger valves and porting.Again, not listed in my '48 to HD master parts cattledog.
Any help appreciated,
Terry.