The engine I took out of my 1966 c-20 3/4 ton parts truck ,this on was really dirty with every thing stock that it was like frozen in time after I took it out took off the oil pan then I looked on each pistions in all 8 of the cylinders,none of them have been marked they do mark them when they rebuild a motor to know what cylinder that pistion came out of.Just wanted to share this with everyone, I will be overhauling this block in the near future to put in my 1966 c-10 shortbed fleetside after I get my Son Matthews 1966c-10 chevy truck on the road we are working on his truck right now.
The 283 thats currently in my truck has lots of miles on it ,but keeps on trucking its been bored out to 0.060 max,retirement after Matthews truck goes on the road maybe couple of years from now Ill get started on it.