Originally Posted by Alberta Bud
I once had a high mile 283 that still ran well and I took it on a road trip. 300 miles from home on the return trip, it started losing oil from around the timing chain cover. I tightened the cover bolts a little and kept an eye on the oil level. It kept leaking oil, but ran fine. I made it home alright by adding oil all the way. I got it on a hoist and we found the chain had gotten stretched to a point that it wore a dime sized hole on one lower side of the cover. I could not believe the engine didn't jump out of time, and ran good with so much slap in the chain. I've never seen this happen before or since.
Ah, yes . I have actually seen this a couple of times . Always amazes me how loose the chain can get without jumping time.