Depends on what year you're looking at.
Anything 2000 and up you're generally going to be safe.
My truck is a 97.5 (right in the middle of the largest batch of #8 issues statistically), and I've had head gasket problems more than anything else. Until I swapped to a good FelPro reinforced head gasket, I had problems.
The early head gaskets sucked. Leaked like a sieve. And I'd hazard a guess that this caused more actual #8 problems than the #8 did.
Either way, I would feel pretty comfortable with most used H1's out there now. The majority of the engines that had problems have been replaced and you're likely going to be fine.
Which year and style are you looking at?
-Steve
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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