The Supertech exhaust valve set for Mitsubishi 4G63/4G63T engines contains eight Inconel exhaust valves in +1mm oversize. Supplied as a set of eight, these valves are intended for applications where oversize exhaust valves are needed after seat work or reconditioning. The Inconel construction is specified in the source description for exhaust valving on 4G63/4G63T platforms.
Supertech Mitsubishi 4G63/4G63T Inconel Exhaust Valve - +1mm Oversize - Set of 8