So many mixed opinions and information!
I think what i'll do is refurb an old S1 head i have here with new SS Valves, Guides if needed, springs, stem seals, cam/lifters, reface it, and clean it all up (including oil ways!), and see how it does with that!
No point spending money I dont have to right now, and maybe look at it again when i have my steel bottom end and EFI ready to go on.

Anyone know a good place to get SS valves from? I've looked about online and can only find standard ones.

Thanks for all your input