I believe that for the 1641, you won't need a different valve, but instead will need another valve. The valves on this type of tractor, I have read, are stackable. I have never done anything with the stackable valves, but I'm sure someone on here has. Good call on the hydraulic front blade - it's the best thing since sliced bread!
Nate
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CCC 784 w/ Triple Hydraulics
IH 982
Cub Cadet Commercial H1748 Walk-Behind
50C Deck
42" Hydraulic Angle Front Blade
41" IH Rear Blade
QA42A Snowthrower
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