Ring, Shelf Stock 91.00MM RING - Single Ring

Our Pro Tru line of pistons utilize a plasma moly pre-gapped ring for the budget minded consumer. Wiseco Sport compact kits include the high quality NPR XX rings, which are the best quality steel nitrided top rings and napier style 2nd rings. Our late model EFI lineup and several small block Chevy pistons are designed around the our 1.2mm Steel Nitride and napier GFX rings. Many of our big blocks utilize a .043 back cut top ring for extra material thickness around the intake valve.Fitment:1992 - 2011 CROWN VICTORIA2006 - 2012 E-150 (4.6)1997 - 2005 E-150 ECONOLINE (4.6)2006 - 2012 E-250 (4.6)1997 - 2004 EXPEDITION (4.6)2002 - 2010 EXPLORER (4.6)2007 - 2009 EXPLORER SPORT TRAC (4.6)1997 - 2010 F-150 (4.6)1997 - 2004 F-150 (5.4)1999 - 2004 F-150 (5.4) 2005 - 2008 F-150 (5.4)2004 - 2004 F-150 HERITAGE ALL (4.6)1997 - 1999 F-250 (4.6)1997 - 1999 F-250 (5.4)1999 - 2004 F-250 SUPER DUTY (5.4)2005 - 2005 F-250 SUPER DUTY (5.4)2006 - 2008 F-250 SUPER DUTY (5.4)1999 - 2004 F-350 SUPER DUTY (5.4) 2005 - 2005 F-350 SUPER DUTY (5.4)2006 - 2008 F-350 SUPER DUTY (5.4)2005 - 2006 GT 1996 - 2010 MUSTANG (4.6)2000 - 2000 MUSTANG (5.4)2007 - 2009 MUSTANG (5.4)1994 - 1997 THUNDERBIRD (4.6)1985 - 1988 900 (B201I)1985 - 1998 900 (B202L/B204L)1990 - 1994 9000 (B234I)1999 - 2002 9-3 (B235R)1999 - 1999 9-3 (B204L)1999 - 2009 9-5 (B235E/B235R)

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