BC valves are made from premium stainless steel, fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head. Stainless Intake & Exhaust Valves (set/24) - (+.5mm - 35.15mm intake, 30.65mm Exhaust). Stainless Intake & Exhaust Valves (set/24) - (+1mm - 35.65mm intake, 31.15mm Exhaust). Specify set (+.5mm or +1mm) when ordering. Valve guides vary and may require honing to size.
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