So I am relatively new to the boating world and I need some advice. I recently picked up a motor from a gentlemen here on the boards, and like most of you, I am always skeptical when purchasing something that me or someone close to me didn’t put together. The guy said the motor was a strong running 2 bolt main BBC with a cast crank and some relatively nice goodies inside. He said the motor was recently freshened up and got new rod bearings, rings and a valve adjustment. Upon picking up the motor, we realized the motor was a 4 bolt main forged crank so naturally we were excited for a little upgrade. However, raised the eyebrow at the fact the guy didn’t know it was forged and a 4 bolt. When we got the motor home, we started to look through the motor, to go through some of the clearances and make sure everything the guy said was legit. Here is what we found:
The Number 3 connecting rod was different than all other 7 rods. 7 connecting rods were smoothed out and used 7/16 nuts and weighed roughly 1632 grams, while the number 3 connecting rod was not smoothed and used a 3/8 nut and weighed in at 1672 grams (see pictures); makes me think at some point it broke a rod??? Ironically, there was also damage to the windage tray directly in line with the number 3 rod. Naturally, I continued to look deeper, only this time I took it to the machine shop. The machine shop said the rings and rod bearings were certainly not new and on top of that, they said the push rods were on their last leg as most of them were different and “mushroomed”. The pictures dont exactly show the wear on the bearings but most of them have a copperish tint to them. Knowing all of this, I called the guy up to ask him if he had ever actually run the motor, and he said yes and told me the machine shop was crazy, and that I should rethink who I have build my engines. He even accused me of putting the motor in my boat and blowing it up myself. I told him that I knew the risks of buying a used motor and not breaking it down prior to purchase, and I wasn't trying to get anything out of him. I was simply trying to get more information about the motor because the more we got into the motor, the more stuff just didn't add up. After a pretty lengthy back and forth, the guy said for me to give him all the parts and he would run them in his boat. I said no problem, I could send them back after I was done going through them. He asked me what I wanted in return, and I told him I didn’t want anything from him, but only to ask him if he actually ever ran the motor. Eventually he said he would replace the rings and bearings after he got the old ones back, however, when I got around to sending them back and asked for his address, he said I should just trash the parts and he wasn't interested in making things right. Long story short, I ask you guys, would you run these parts in your boat or replace them? How much of an issue is it if the pistons are different weights? I know you can adjust the springs to correct minor differences in push rods, but would you run these rods in your hot rod? Do the rod bearings look new or pretty used up? Let me know your thoughts.