HG is blown......hard to say on the est. but expensive, I suspect $1500-2000 range.

 

Whats the likelihood of cracked head? And would that be more $?

 

If its a cracked head, you would need to replace it. If the engine was overheated, your mechanic could find most anything.

 

previous owns says he will give me my money back plus $400... that puts me out about $600 and more informed the Toyota engine... thanks for all of your help!

 

Welcome! Lucky your seller seems to be an honest person at least after the fact. Seller may very well have known the HG was gone and put sealer in the cooling system to bide time. So, you are out of that vehicle and can search for another, yes?

The 3.4 is a good engine so don't let this incident scare you off of them,

 

You might be able to save some money using rockauto.com
The dnj kits are really well made..... DO NOT USE FELPRO ON THIS MOTOR!

DNJ ENGINE COMPONENTS Part # HGS965 states they offer an upper rebuild kit for under 160 and I use them. They haven't blown on me yet and I abuse them harsh like in deep mud and hard off road driving.

Might make it more affordable