Silly question ?

[Robert Leigh]

As you go aong the block, you get exhaust, inlet branching inside the block, exhaust, exhaust, inlet branching again, and exhaust. To make sure each vave is fully closed for setting clearance make sure that a corresponding valve is fully open, ie set no 1 when 8 is fully open, 2 when 7 is fully open, 3 when 6 is fully open, and so on along the length of the block.