Read this before you swap...

HardVG said

Old post for sure, from what I have read this was a more significant problem with the early motors, but if you do overheat them then the valve seats are very likely to drop out as you have two different metals with different expansion rates that are only press fitted together. Basically keep your cooling system properly maintained and stop driving it at the first sign f trouble just like you would if the oil light came on.

Click to expand...

Years back looking for a 5.7 for a Magnum everything we found under $1000 had the valves dropped in it, those under $600 were if not window'd then f'd short blocks. An $1800 used motor in a car that mayn'tve been worth $7000 didn't make sense. JY bought the car for more than he had at auction, so it all worked out.

Things like this seem to be how these newer motors fail anymore- most of what I've seen has made it look like it's the same old, same old with neglected stuff giving trouble and that's just how they do.