[Crazy Ivan]

I just rebuilt my motor on my tundra and its not that hard at all.

I agree with above posts. Make sure you do compression test, leak down test (get numbers) and check if coolant leak else where. I had 340,000 miles on my motor and head gasket is still good. I think toyota makes one of the best head gaskets.

Parts you need.
Head bolts (10x$6 each), Head gasket (I think its around $100).
If I were to replace head gasket on a passenger side, it would take me around 2 days, and I am not a mechanic. You will need to take intake manifold off, exhaust manifold off, plastic that cover cam gear off, timing belt tentioner off, remove cam gear, remove valve cover, remove cams, remove 10 head bolts, and do the same in reverse. One day to take it apart, another day to assemble everything back. Even at $70 an hour its still runs about $1,120 and about $300 in parts.

So if I were to do this, I would replace whole entire engine with low miles (and it would cost about $200-$500 more then rebuilding this engine)