it takes two revolutions
As I said before, it takes two full revolutions of the crankshaft to go through the firing order. There is an obvious difference between the compression stroke and exhaust stroke - even though both go to TDC position on every rotation. If you start with number one on compression - the second cylinder in the firing order will come up in 90° and so on - there will be a second piston at TDC in every case - but adjusting the closed intake valve on it risks being off the base circle. Every 90° the cam closes both valves on a cylinder - that's the one you want.
The micrometer effect of the rocker nut -
A 3/8-24 UNF nut moves the pivot down .042 per turn ÷ 6 flats = .007 per flat. For a 1.5:1 rocker this means that three flats (180°) will compress the lifter plunger 3 x .007 x 2.5 ÷ 1.5 = .035". If you turn it 6 flats (360°) its doubled to .070".
For a 1.6:1 rocker - the math is 3 x .007 x 2.6 ÷ 1.6 = .034" (in 180°)