They leak as much as the rest of the seals? Lmao
Mine doesn't leak! It's amazing what following the book will do. Can't tell you how many cam caps i've seen leak because people don't put flange sealant on them.
Also if you think about it could be related to blowby, which is related to the rings.
Detroits always leak from the oil pan, crank case, or valve cover. All related to crankcase pressure.