Aug 29, 2013 #1 R RobS Member Joined May 26, 2001 Messages 190 The sealing area is pitted from rust. I used a 3m rust remover to clean off the large chunks. Attachments P1010339.JPG 633.4 KB · Views: 133 P1010337.JPG 631.6 KB · Views: 126
Aug 29, 2013 #2 B bison Moderator Staff member TurboBuick.Com Supporter! Joined Dec 19, 2005 Messages 18,053 I would sandblast it and make sure the area where the flange sits is flat. It will seal fine.