2008 5.7 value?

Is it damaged at all? "Ran when parked" and damaged can go hand in hand. I recently sold a 2010 5.7 for an uncle of mine for $900 with 2 broken valve guides (1 per head) and dropped seats on those valves. It was running fine in his challenger but had a valve tick and decided to get it looked at out of precaution. That is when his mechanic found the damage and he decided to go with a whole new engine instead of repairing the one in the car because he needed the car back right away and didn't want to wait for the repairs. I sold it full disclosure and made sure the buyer saw the damage before any money was exchanged, he was very happy with the purchase. That particular motor had an excellent short block but was going to need both heads to be taken off to be repaired/rebuilt. The average "core" price to exchange for a rebuilt one seems to run at about $1,000 so maybe you can go based on that.