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steve92skidoo 01-18-2002, 01:38 PM I have a 1992 Mach 1 with a 617 and I am thinking about changing my rotary valve. *I would really like to know what is involved in the switch. *What do I need to do not to screw this up? *Do I have to change anything else for this "mod" to work? *Any info from someone who has done this would be great. *Thanks Steve 670HO 01-18-2002, 01:51 PM There is one special tool that you will need to get from skidoo. It is a degree wheel that you use to time the valve. Other then that I am not totall sure. I am going to be doing this soon so I will let you know how it goes. kid rocker 01-20-2002, 09:12 AM You definately need a degree wheel. *Try sending Idooski an instant message, he has a lot of experience with the rotary valve. | ||