MSD 8.5 Spark Plug Wires This is a set of "MSD 8.5mm Spark Plug Wires" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. 8.5mm Super Conductor wire sets have a special helically wound core that has just 40-50 ohms of resistance... MSRP: Was: Now: $109.00 Add to Cart