MCS Valve Keys

4 products — part of all Valve Keys

MCS valve keys cover the split-cone retainers across the widest span of Harley-Davidson engine history in the section — from 1936–1947 Knucklehead and 1948–1965 Panhead through Shovelhead, WL Flathead, and 74"/80" Flathead, into the Evolution Big Twin era, Twin Cam from 1999–2004, and the XL Sportster from 1957–2022. What makes MCS the practical choice here is exactly what defines the brand overall: depth of catalogue coverage that means you're sourcing the correct retainer in the right diameter and material rather than trying to adapt something from a generic parts supplier. Each valve key application is engine-specific — the installed height and cone angle differ across Harley-Davidson platforms. Iron City Motorcycles, an authorised Harley-Davidson dealer in Leeds, stocks MCS valve keys for both vintage and modern engine rebuilds. Browse the full MCS Valve Keys range below.