I’m currently building my own engine that is also running a HKS V2 Supercharger
I am not upgrading the valves but I am using GSC beehive springs so somewhat similar
From the research I’ve done the OEM head and camshafts are actually very good and flow quiet well, I think if you are going with new valves a +1mm oversize on the exhaust valves and some light porting is probably all you need to extract the maximum out of a HKS V2
I think the lack of aftermarket cams probably says a lot about the ultimate need for them when not chasing huge numbers, but of course that’s just my opinion.
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