Proper break in? They are already run before you get them. I always recommend beating it good once up to temp out of the lot.
Long term affects- A well seated motor with no oil consumption issue's. Long life out of motor. This is from years of seeing these motor's. Dynoing them ect. I always ask how they were broken in. The better cars are beat off the lot.
As for this blowing up. Doesn't surprise me in the least. The C7 we built had the worst spec'd GM motor I've ever seen. Cylinders out of round and machined wrong, pistons are the cheapest gm ever used- ours cracked apart, tune- most knock I've ever seen out of a stock car. Oil consumption was real bad too from ring flutter.
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