In the early to mid 1970s I made a bunch of money replacing warranty short blocks in these. Didn't take long for GM to realize the aluminum cylinder walls weren't such a great idea for the general public.
Steel sleeves made them a fairly reliable engine. The A/C equipped cars weren't as likely to score cylinder walls due to having a larger radiator. Replaced a lot of valve seals and diff pinion bearings in these as well.
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