valves are not bigger. same
you can get cheaper valves... but they will not be inconel. Theyt are £375 inc vat from me for one piece stainless steel inlet valves and inconel exhaust valves (which are never one piece, as the tip has to be hardened for collet grooves)
I have previously done Pauters for £500 ish, but exchange rate was favourable then.
Eurospec rods seem strong enough in mine so far, but then again so were my std
ibiza ones... (except they did'nt rattle like these do)
rifle drilled next time me thinks,.