You have an older ultracut deck and they are absolutely famous for the cut quality and stripping. I wouldn't dare touch it. They do clump some in the wet but other than that it is am awesome deck.
2013 Gravely 460Z 29EFI
2011 Gravely 36GR
2008 Gravely 160Z
2004 Gravely 34Z
1998 Lazer Z HP 48 (old faithful)