[4dblnkldude]

Interesting discussion. I have broken two 103N cranks. The first was 1996. There was nothing left usable on the entire engine, except for 6 pistons I gave to someone else that I would never use and don't even know why he wanted them. I was young and found what I thought was the cause which was 11.5 to 1 on pump gas, so I assume the crank may have lived if I treated it right. It was an expensive lesson for a 20 year old and I learned alot. After that so many people tried to convince me to go Chevy. More recently in 2013 we had a 455 built for my neighbors lemans (now my buddy Marks car) . I bought that block and crank from another guy in 2005. It had been in his shed for 20 years prior. We had everything magged and everything passed. My local guy here, who I still use built it, We got the car running but he just never did anything with the car. This was 2013. The car sat until 2019 when he said he wanted to "get back into it". So we got the car up and running again but this time I heard a tick and thought maybe it needed to build oil pressure. We eventually tried everything, flexplate, trans you name it. The engine still had oil pressure. We eventually took the engine out and back down to my guy. Turns out the crank was cracked and he fixed it for free (labor) 6 years later. Now this crank was out of a big car in the early 80's, sat for 30 years, had 20 street miles with a few burnouts on dryrotted 14" radials. Is this fatigue? Coincidentally the same balancer was used but it is now on an eagle crank. I guess we should get that off of there? Sorry long post