I'm having trouble getting the coolant tube out of the block. So far I've tried all the obvious things like vice grips and force, heated up with torch (twice), penetrating oil (soaked repeatedly for 2 days), Dexron III (immersed 3 days), CLR (24 hours so far) and high pressure water. Oh and before I started the machine shop tanked the block for 24 hours as well. I'm about to give up on this block..... On my other two engines the thing just slipped out no drama at all.