My GEMS 4.0 has started blowing to atmosphere from one of the driver's side cylinders. It's not quite as loud as Miah's was (yet!) but it's definitely doing it. Clearly I'm going to have to do the head gaskets, but since I actually need the car to run around in I need to get it done as quickly as possible. I've not really done one of these before (although I've changed heads before), so here's the list of daft questions:
Do I need to get the heads skimmed? Up until now it's been going pretty well without losing more than the expected amount of oil or water. I can probably find someone to check them for flatness nearby but they'll take a while to skim them.
When Miah and I leakdown tested it a few months back it was about 20% evenly across all eight cylinders. Is it worth dropping the sump off and doing the piston rings too? That starts to get into doing bigend and main bearings as well, I guess?
If I do pull the pistons out and stick new rings in, what do I need to do about the bores? I've read various things about using those three-legged grinding stones and bogbrush type hones to break the glaze, presumably that's pretty important if I disturb that part?