Knucklehead cylinder casting tags

[8 valve]

Hello
have some old 74cui knucklehead cylinder with mystery tags,no casting marks on bottom,can anyboddy help ???
thanks Harry

[Chris Haynes]

A memory serves that is a 1941 feature.

[Speeding Big Twin]

Harry, there's a bit of info via the link below that may be of interest. Eric

http://www.antiquemotorcycle.org/bbo...ad.php?t=15878

[8 valve]

thanks a lot ,your information was verry helpfull
Harry