[dynoman]

I just went to my shop and took this picture of a Dodge Magnum 360 with over 200k miles.



It was a running engine I used to test on my dyno with factory fuel injection. It was in preperation for the other 360 engine I referred to. That 360 had so little cylinder wear I was able to use .005 over Diamond pistons. I honed with torque plates and removed maybe .003 - .0035 off the cylinder wall, and it cleaned up perfectly. The Napier second rings probably account for some of the low oil consumption for that engine. Most people change at 3000-5000 miles and don't really know what an engines oil consumption is if they don't add between changes. Like I said before I change at one year or 25k miles, when you do that you know if the engine is using oil.

[eastexsteve]

I just went to my shop and took this picture of a Dodge Magnum 360 with over 200k miles.

Notice the areas where there are no hatchmarks. The factory bore being out-of-round to begin with can cause this. The reason you still see some hatchmarks is because the rings never fully seated in those spots. I've see it a lot on factory engines, especially American cars. If the bores were perfectly concentric, the rings would properly seat and there likely would be no measureable oil consumption. The fact that you used torque plates to re-bore it will remedy this.