I Just purchased a 48 8N. I bought it knowing it had issues, the lady I bought it from said she thought it had thrown a rod. I finally got it started after rebuilding the distributor and it made a screeching noise like I have never heard. Extremely loud. When it first started it idled fine but applying power made it screech. There was no knock. I removed the belt to rule out the water pump or generator, but the screech continued. I drained the oil and cut the oil filter open, no metal anywhere. I am suspecting a rod bearing, and plan to drop the oil pan this weekend. Does anyone have any suggestions as to what they may think it is or know of anything that I should be looking for? Thanks in advance.