30mm (+2mm) stainless steel exhaust valves with matching cotters

I bought the whole lot from Burton Power for £140 in January

Burton said you can retain all the standard parts in the head and a straight swap, the head just needs a bit of machining which I have been quoted from £80 up to £110 for, including the fitting of the valves.

Everything is still in its packaging so I would like £130 including p&p

In the pic is one on display with the cotters, all the rest are sealed