This is a set of "Gn1Performance 5970 Connecting Rods" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. These are stock rod replacements that are custom built to fit your stock crank. They are bushed full floater rods which are made out of 4340 billet, 5.970 in length, .940 bush pin, 2.249 Crank pin, and are for narrow width journal cranks.
