Swiftune Manifold Gasket, manufactured from a steel reinforced material and a larger Gasket O.D to last longer, give better gasket support and a greater sealing surface.
Road Gasket port sizes are -
Inlet - 1 3/8" (35mm)
Exhaust - 1" x 1 1/8" (25x29mm)
Perfect for use on all Standard and upto approx Stage3 cylinder heads.