ADE 500 - cheers mate just need to confirm what thread size WRC long studs are then i can see what nuts i can use! not sure if theyre wider than normal head bolt threads, but they look pretty fat.
Reckon my best bet is going to be ordering some k nuts.

will get on it shortly if i can grab a lunch break

Brammer - defo would haver just opened the head holes abit like you have . but shes just been freshly lapped in and built up so im not stripping it down again