It's been snowy here so I looking inlet port shape of EW10J4S (206 GTI 180 engine) cylinder head. Diagram taken from Peugeot Sport documents. I tried to show my idea with blue line on drawing. Idea is rised short turn radius apex via welded aluminium and reshaped. Also top of port will slightly enlarged but I will not touch behind of valve guide at long turn radius. I will also cut valve guides. I know valve guides already shorter than J4 head. I know lots of professionals prefer start with EW10J4 (206 GTI engine) with smaller ports due more material for better shaping but I want to use J4S head for my project.
Its long rod, high comp engine with lumpy high lift cams on solid lifters. Valves stainless steel with 6mm steam. Its not daily drive or rally engine. My power band aim is 6000-9000 rpm or 6500-9500 rpm with 50mm bodies. Its a little big but I'm already looking 48mm ones.