Description Sizing Note: These valve stems will measure 7.885 MM. This should be perfect for all 8mm aircooled applications. But due to a wide variety of new and used valve guide sizes in use, It may be necessary to replace oversized or worn valve guides to achieve proper valve guide clearance. These Stainless Steel valves are high quality "Made in Italy" one piece forged stainless steel with swirl polished heads. Suitable for both intake and exhaust. Sold each. Click here to see all sizes of valves available.