Was trying to fit my RBC manifold yesterday but was not able get it out because of 2 bolts on the top and not having having enough space on the side......
tighten 2 nuts together on the stud and undo the one you put on first (the nut closest to the cylinder head) with yer spanner to remove the stud from the cylinder head, you only need to take one out, the one closest to the P/S pump...