Ferrari going down the steel route for their 2026 V6 cylinder heads rather than Compacted Graphite Iron seems an interesting choice
CGI has higher strength & stiffness and better fatigue resistance & heat dissipation than steel but without the weight penalty. Plus, it's been used to great effect in road-going diesel engine blocks (mostly VW Group and Ford AJD-V6 / AJD-V8) for some time now.