How many LS swappers are rebuilding their engines before Installing them?

[blue96]

Roll the dice on a junkyard motor or rebuild, I'm wrestling with this right now..

 

[Old77]

IMO the only way I wouldn't go through a rebuild prior to putting the motor in is if I knew the history on the motor and what it came out of and/or was able to hear it run prior to purchase. Outside of that I'd much rather be safe and go through it before putting it in any truck.