Overview Reviews Product Description Supertech R81-GNH8100 81mm Bore Piston Rings High Performance Gas Nitrided Supertech R81-GNH8100 Product Videos Custom Field Product Reviews Write a Review Write a Review × Supertech Supertech R81-GNH8100 81mm Bore Piston Rings High Performance Gas Nitrided Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *