Tore my 71 455 down today. The engine is out of a delta 88 convertible. I got it as a short block and was impressed with the almost nonexistent ridge in the bores! Not sure who owned this car/engine but damn was it full of sludge! The valley was caked with baked on sludge and it was just all over! Upon breakdown I was suprised the main and rod bearings weren't all worn out! Anyone find one like this?

 

Tore down two so far same story hard carbon/ oil
Deposit low mileage cylinder bearing wear

 

The bearings weren't worn through but they were kind of pitted. The piston skirts were a bit worn as well but the bores looked good.

 

10w40 oil.