Wait a minute. Are you saying that your truck had overheating issues at 34k. And ten years later the problem manifested itself as a blown HG???? Sorry to hijack the thread. Is that typical???? I just have this crazy picture that all if a sudden, while you are driving, the engine or the radiator just blows. Or if I read between the lines you stalled or slowed down the head gasket from blowing for ten years??????????
Well, I guess I made it too much like the Reader's Digest version. My apologies.
Here's what happened: For the first year or so after I bought RedCruiser she ran fine. Not a whimper. I took her out all over So. Cal. to the Upper Mojave (Jawbone Canyon, etc.), Anza Borrego Desert, Big Bear, etc. I think it was during the 3rd year (maybe 2002) the little heater hose behind the engine popped a very small leak. I didn't really notice it but during the summer I was on the freeway out by Palm Springs and the coolant level dropped enough to send the hot needle all the way to max. I pulled over as quickly as I could and filled up the radiator and went on my way--filling up periodically until I got home.
After a couple of trips to a guy that didn't know LC's that well, we found that pesky hose and replaced it. Then the next year or so (again in the summer) the radiator sprang a leak and the engine, again, overheated pretty badly on the freeway. So I had two episodes of serious overheating within a couple of years. A couple of years after that I started losing coolant and nobody, including the guys at TLC in Van Nuys, CA, could find a leak.
Well, finally, I found a guy at Arrow Automotive in Azusa, CA who was recommended to me that found the leak (a very small crack) inside the head. He replaced the head with a rebuilt and off I went. Everyone I spoke to said that the worst thing you can do is overheat any engine with an aluminum head or block. So now with the head fixed off I went on many more 'wheeling adventures with no troubles.
The other thing I should tell you is that for several years I pulled a 7x16' Haulmark enclosed cargo trailer often with a gross weight of 3,500lbs to 5,000lbs from California to Arizona. In that three years I probably made that trip 40 to 50 times. So RedCruiser's original engine had quite a workout by the time it got to 200,000 miles and died.
I was very happy that it lasted so long considering the beating it took taking me hither and thither and yon off road and pulling a fairly heavy trailer back and forth from Arizona to California. The best advice I can give if you live in a hot area is swap the radiator for a 3-row (stock is a 2-row) and check the heater hose in back of the head periodically and if it's at all suspect, replace it. Do that and you should never have an overheating problem.
So that's the story. IMHO, a Land Cruiser's engine is one tough puppy and able to take massive punishment. I made the mistake of letting it super overheat a couple of times and that cost me a head and I'm sure weakened the rest of the internals. Then I beat the stuffing out of it 4-wheeling and pulling my trailer which, of course, is my fault. I'm very happy with the replacement Toy engine and although it would be very cool to have 300+hp and 500+pound feet of torque under the hood with a diesel, until I put another few hundred thou on this one, I'm cool enough. No tractor pulls for me.