true,( too many posts ),previously it was suggested a 5/8 dry gas hose between the vaporizer and mixer be installed, it does not mention (or i missed) if one was installed. I dont recall seeing an Impco system useing 1/2in. tubeing in that application.If the engine used to have an Impco vaporizer that ran with this tubeing I would not mention it. It just seems to be the only unusual item in the system as described.