Well, to grizz/matt- I tried changing the bearings on my 7 port today. The engine is not broken in yet but developed an air leak around the front bearing. As you know I asked for help. I got help. I watched the utube video of the guy heating up the block and hitting it firmly on the piece of wood-that did not work for me. In the oven for 45 minutes at 300 also did not work for me. It helped when I used the ofna puller/installer. actually when I do my next engine I will take a heat gun and warm case up that way. what a pain in the ass. I also managed to kiss my ebmodded 5 port good bye. I am totally to blame for this one. c clip pooped out ruined every thing except for the crank. which by looking at it must have already pretty much gone when I replaced the wrist pin con rod. It fit good when i installed because it was ovaled. Had I mic'ed it I would have known. Newbie mistake. One other lesson I have learned never buy used engines or electronics. So as soon as I let the sealant dry on this engine I am going to check for leaks and hopefully I will have to stock 7 ports that I can use until the new go engine line comes out. All in all I am glad I tried this only because I learned something. all at the same time.