If Vulcan heads are as good as their valves then I wouldnt touch them with a barge pole.

Vulcan oversized Valves, which were used in my last head, did a fantastic job of being social ....dropping into say hi to my pistons ......
they objected to the over friendly valve head & atempted to eject it ....but he wasnt willing to leave without a fight .

All the above whilst runnig in revs limited to 4K(management governed)

Result of (defective valve @ steam/valve head)

One totaly mullerd engine!

Why? all because of a poorly manufactured Valve.

Nice one Vulcan