Perfect for high performance road or race use. Chamfered ports and edges. Low silicone content for added strength. Thick and strong skirts. Quality gas nitrided steel rings. Proven reliability for high boost and high heat turbo race motors. Fully machined crowns include valve recesses ready to go. Exceptional quality. Set of 4 with rings. 20 Thou (.5mm) 40 Thou (.1mm)
