This is a Predator version of the popular (but expensive) GX160 Hi-Compression 14cc head with valve guides installed and valve seats installed and cut. Looks like a standard clone head, rather than a Honda head. The combustion chamber is 4cc smaller than the standard clone head which gives about a 1 HP boost to a plain stock engine. There is room for additional milling of the gasket surface to get even more compression. Seats are for standard 196cc Clone, 1st generation Predator 212cc or Honda GX200 valves with 5.5mm stems.
For 3rd Generation Predator 212 with 5MM valve stems, use stainless valve kit ARC_DJ-SSVALVE-KIT