Originally Posted by subzali
Why is there any difference between honing in-chassis vs. rebuild/hone in a machine shop? I mean, the honed cylinders have to broken in either way, and if the rest of it's good...
Because all you can do in-chassis is hone the cylinders and use the same size piston rings you just took out. If the block goes to the machine shop they can bore the cylinders to take out the uneven wear and allow you to put in oversize pistons/rings so the engine seals up like new.