I don't know why folks are getting their knickers in a wad here about honing the bores. First of all Volvomad clearly stated the engine has "very big hours" on it, so we're not talking about a machine shop rebuild, just getting all the life he can out of the engine before it does need rebuild. Second, what is the purpose of honing a cylinder? Plain and simple, it has nothing to do with compression or sealing of the rings to create compression, it's for lubrication of the rings/pistons. The crosshatch scores of honing creates tiny valleys to retain oil for lubrication of the pistons and rings as they move up and down. Over time, the rings "polish" the cylinder bore and effectively erases these crosshatch lubrication scores, what's known as "glazing" of the cylinder. This "will" accelerate wear of rings and pistons because lubrication is insufficient. So, in a pinch, I don't see the harm in using a dingleberry hone to "de-glaze" the bore. Yes, honing debris will be generated during the process. Some brake cleaner and compressed air will blow out the bulk of it, and so what if there's a little left over, it's a "very big hours" engine. What's left will be burnt off quickly when the engine fires off and will be of little consequence on this engine. Give the bores a quick crosshatch with a flex hone, blow it clean with brake cleaner and air, put bit of oil around the piston to lube it on start up, button it up and let if fly. jmho