I don't think I need to lap in the valves right now (and as it's not my car shop I want to get out of his way asap so as not to abuse his kindness). I scraped down the head and have gone over with compressed air, will go over it one more time tomorrow. I lightly scraped down the block and compressed air, will give one more round again tomorrow.
the scratching is just where I started to scrape a bit with a bluntish screwdriver to get a better look at the damage
Here's what the sum up is. There is still some cross hatching visible in Cyl 1 but not in 2 3 and 4 (unfortunately). (I should really have got the block rebored when I took it out first time, but...)
my car man said the block is tired, but if you just want a get about car you should be ok. The plan is to get a new Payen gasket on tomorrow, do the heat cycle and check.
What my options are from here and this is where I really appreciate your input (to be honest this made me feel quite out of my comfort zone, needing to fix the car and wanting to use it, but being more comfortable with the engine out and doing ALL the measurements in full before going any further)
get it all back together and expect to have to put in a bit of oil now and then, maybe get 2 more years out of it in this state ?
when the motor comes out what is better
- get a newish standard block and put in the original pistons with new rings
- get the block bored to the next size and add new pistons and rings (what worries me here is the center gap where almost all gaskets go, is getting even thinner, which just doesn't seem to make sense)
that's it for now, thanks so much for reading and commenting - limping along for the time being. Perhaps soon it's really time for new crank bearings and good and proper overhaul. I think I erred on the side of optimism with my first rebuild. Cheers.