i have a jdm f22b Dohc and today i took off the spark plug and on the 4th sparkplug it was all dirty on the tube that goes down to the spark plug so i took off the valve cover and replaced that little gasket and i see that some off the oil on top was white (when i drained the oil it was brown) do you think that could be anti freeze mixed with the oil then i was looking and i seen that there was a little rust on the top of the cam lobe for the 4th cylinder is this good or bad and should i take the cams out of the h23 they have no rust and put them in there??

also on my f22b there are 8 loose bolt under the valve cover i think the adjust the valves they have a flat head on top and have a nut on it how do i adjust them and when i looked on my h23 there was like 12 loose ones

 

anyone know