Boxerboy55 Well-known member UKGSer Subscriber Joined Jan 11, 2007 Messages 2,848 Reaction score 83 Location Central Scotland - no more far away Mar 19, 2019 #1 Surprised to find the RH header has a big orifice plate in it. Should there be one, or two, or none? Attachments F2363EEF-8592-4908-BF39-5A81DEB92B57.jpg 179.2 KB · Views: 166 1EED0E7E-2C46-4BFC-AD31-A9C6B82A2C2D.jpg 189.6 KB · Views: 163