Stainless Steel Intake and Exhaust Valve Set This is a set of "Severe Duty Pro Flo Intake and Exhaust Valves" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. These Valves are for Factory Iron production... MSRP: Was: Now: $489.00 Add to Cart