ok, with your plugs:
the outer ring on the edge of the thread is the bottom end, and the tip (bend bit) is your top end.
to read the mix, you just need to know the colours. stoich is a nice dry black, over rich is also black, but you will notice if you take the plugs out after it has just runs, there is still some visible fuel on the plug. then for your leans, if they have that brownish tinge it is starting to lean out a bit, and if they start turning white then you're into danger zone.
If you're ever querying your electronic readings, check the plugs - they can't make computing error!! :P :y:
comp ratio is standard, or maybe a pooftenth higher as this head has been skimmed a couple of times.
Just using a permaseal H/G at the mo, as that is what was available.
Timing is locked at 20o BTDC.
the car has been running boost since august last year. Blew a couple of head gaskets about 2 months later, due to full timing advance. since then I haven't changed a lot, apart from timing!! :P so its been running well now for over a year with no issues. ;)
the car gets given driven hard every time I drive it!! ;) which would be 4-5 times a week. I have a work van I drive to work, so the coroola is a bit of a run about & fun car, and my mazda is sorta a weekend cruiser.
With so o-rings, and the copper gasket, you should have no dramas at all!!