Joseph The dual snorkel air cleaner housings came with vehicles the factory produced with dual exhaust. In Imperial speakie that means the "Rag-Tops" and any special order Imperial. The dual exhaust engine may also have a power steering pump with a larger diameter pulley on it. Starting in 1967 they changed the exhaust manifold from the style they had been using on non lettered 300's and the such and called the dual exhaust / dual snorkeled engines the "HP" 375 horse powered 440. ( The 383's in lessor vehicles also used the same manifolds and etc. The six-pak 440's too. ) The first style had the large round tube. Then came the style with the taper and then ... Rodger & Gabby Colo Spgs '47 De Soto Custom w/Fluid Drive & passenger door mounted swamp cooler '63 Le Baron w/F-Sweep trunk lid & std A/C '66 Le Baron w/dual A/C & reverbed AM/FM '70 Overlander - InterNational '77 D150 w/360, NP 4 Spd, 12 Bolt Axle, OEM Buckets & etc ----------------- http://www.imperialclub.com ----------------- This message was sent to you by the Imperial Mailing List. Please reply to mailing-list@xxxxxxxxxxxxxxxx and your response will be shared with everyone. Private messages (and attachments) for the Administrators should be sent to webmaster@xxxxxxxxxxxxxxxx To UN-SUBSCRIBE, go to http://imperialclub.com/unsubscribe.htm