I have heard of people having their pistons skimmed/milled to remove valve marks and I wasn't sure if this could be done to lower compression. Has anyone done this or is it just much better to buy a set of lower compression pistons?

 

Just buy the right pistons so you don't have to pull the engine twice

 

well even if they could, lol how much is it to have pistons CNC'D? Is it cost and time effecient to have your stock pistons CNC'D to make them shorter, making them weaker, Or is it better to just get decompression pistons, that are designed and proven to work. I would just do it right the first time, lol plus if you mill them then you got to have them balanced. Sounds like a hassle to me!

 

While it is probably possible, I doubt it is the best or most cost effective method for lowering compression.