Were you able to examine the bottom end of the engine when you had it apart to change the oil pump? Another thing that comes to mind is possibly a low quality oil filter.
I don't think I've heard of a timing chain jumping 180 deg. That's unique.
As far as the crank, you shouldn't need bearings of a different size than standard, unless you spun a bearing or otherwise had one fail on you in which case you would probably need to turn the crank to take out the scratches, and then get the proper size bearings for it. I'm not sure if a shorter stroke will give you more HP. The engine will rev quicker, but your piston displacement will be less.
Tuesday, January 23rd, 2007 AT 4:23 PM