Well that was a pretty awesome post calj. If only you had it posted earlier! LoL
Hey I'm kidding ok? Don't want to start fussing about nothing again right? Anyway, back to the topic, as I stated in the very first post, my hopes for the engine to be fixable weren't so high, exactly for the reasons you detailed: detonation in the cylinder, prolonged low compression (months/year), pieces of metal going around at least one cylinder (I actually suspected 2 were inolved, in fact I though the broken one was the 1st not the 2nd, which already had the low compression issue) cracked cylinders/rods/crankshaft, valves and whatever else. Having a look at the cylinders gave me some hope again but I still have to bring it to a friend for some proper measurements (ovalization, bearings and such).
After reading what you said I think it's pretty much game over again. The one thing I wanted to avoid was the overbore and change of the rods/crankshaft. I was fine about changing all the pistons and bearings eventually, but only if the crankshaft and rods were in "mint" (note commas) conditions, which probably aren't.
As for the warped head, I must say I didn't untorque them in the reversed sequence, but I used a criss-cross pattern going from the center to the sides, very carefully but only that. Had no idea I risked to warp it. I'll have it checked but again, we're probably talking of a dead motor anyway so.... I'll see, now I'm back to work (real work, not chill hobby in garage) so I think nothing will happen before the next week.
Anyway, keep the good post coming. I knew you could do better
