SPR9903 030 suit 4.030" bore +.030 5/64" X 5/64" X 3/16". These Speed-Pro plasma-moly piston rings are designed to stand up to the rigors of racing and high performance street use, while providing a long service life. Just look at some of these features: Plasma-moly coated, barrel-shaped, ductile iron top rings that seal against blowby when the piston rocks in its bore; tapered secondary rings that seal against the oil control ring's upper surface for excellent oil control; and 3-piece oil rings with stainless steel expanders that provide proper tension without robbing horsepower. What more could you want? Specs: Bore (in): 4.030 in. Bore (mm): 102.362mm. File Fit: No Top Ring Included: Yes Top Ring Thickness: 5/64 in. Second Ring Included: Yes. Second Ring Thickness: 5/64 in. Oil Ring Included: Yes Oil Ring Thickness: 3/16 in. Oil Ring Tension: Standard. Gapless: No. Top Ring Material: Iron. Top Ring Facing Material: Plasma-moly. Second Ring Material: Iron. Second Ring Facing Material: Cast iron. Oil Ring Material: Stainless steel. Quantity: Sold as a set.
