904 / New Converter, abnormal noise

i checked the converter snout before Installation, it fit´s perfectly into the crank after removing some paint. The welded on tabs are pretty Long and massive, so i do not think the bolts (ARP 7/16") Bottom out. Installation went smooth without Trouble.

Inspection cover removed, no contact between bolts and cover or block.

Fluid Level was carefully adjusted….what would cause it to bubble?

I´ll contact the manufacturer (PTC), maybe they have an idea what can go wrong inside. I wanted to get into the tens finally with this converter….seems my best bet is to remove trans / converter again.

Michael