These engines have reputation for having short lives. If turbocharged, they went through headgaskets at 20,000 miles. Non turbo were longer. The blocks were poorly designed with no support at the top of the cylinders. GM quit making them after 15 years or so. But as I said earlier, they are plentiful right now from the scrapped mlvws, and with the limited mileage of a tracked vehicle should do alright.
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