I'm planning on a rebuild of a '89 ER27 to swap into my VW Vanagon. I'd like to pick some of your brains to identify weak points on this engine & ask some questions: Block: Prone to cracking or warping? Rotating assembly: Any durability issues with crank, rods, rod bolts, or pistons? Heads: Prone to cracking or warping (or leaks - water, oil, exhaust, or combustion gasses)? Head bolts: Any known issues? Oil system: Any issues with leaks or low pressure? Pump