not entering in casting....
the point is, if this dipling efect could benefict (3,8%) our tu5j4 or jp4 heads?
more than normal polished finishing?
i put a video makinkg the dimpling in a saxo head, in tranlate i can help!
https://youtu.be/iKbmrQIQOr0
and since this guys are local to me....maybe a option for head builder.