The 8BA ones I'm looking at have no visible stamp near nor around the water outlets. No visible marking on the gasket side either. For a 70 yr old set of heads, the chamber side surface looks better than average, so maybe it's been resurfaced eliminating the stamping. Looking for a low compression set of heads for a blower setup or....will have to resort to a thicker head gasket to lower the compression closer to 7.0. Per Roadrunner's charts Weiand had the highest cfm air flow numbers unless you get into exotics like Baron's ($2,600.00+, 6.1 C.R.). The price may be due to the 2nd name on the head (Tattersfield). $1,300 per name.