I worked in the service dept at Luby Chevrolet in Boston 1967-72 and never saw a blown engine warranty claim denied it was always the solid lifter engines that blew up there was a corner of the shop where all the blown blocks were located i remember the zone rep would come once a month and look at them and beat on them with a small sledge hammer so they could not be re-used mostly broken valve spring with piston damage or a rod through the side of the oil pan.
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