Seems to be about the mileage many of these 5.7L Hemi engines grenade, due to the valve seats coming loose from the heads... That would be a design flaw, not an initial assembly failure.
I would assume by "assembly failure" they meant the assembly (rotating?) failed, not a failure due to incorrect initial assembly...
I'm thinking that a valve seat is what failed, and they're just telling the OP a basic reason to "not get too technical" ... the receipt should have the tech's findings in his own words, although they may have been edited by whoever printed the final receipt.
My car had performance heads and still dropped a valve seat with only about 20-25k miles on those particular heads, about 45k miles on the engine.
Needed a new engine.
About $4k later, after another $4k in earlier repairs from a broken valve spring, the car got traded in since I lost faith in its reliability ... I miss the AWD, but my FWD Focus has been awesome so far in the snow, and the Mustang is a lot more fun than the Charger ... completely different animal of course, but still ...
I would think assembly failure to be the long block. I always ask for replaced parts to be returned to me. I have the failed seat that did my motor in. About 1/4 of the seat disintegrated. I still drove the car about 30 miles home. My machinist knew the problem before I dropped the motor off. To avoid a repeat all seats were pinned. Was back on the road for under 2k.
I am at 127,000 and have not had any engine related failures like this. Car still hums down the road. Any engine can fail from any manufacturer at any time.
It's good to hear stuff like this, because I definitely don't like preparing myself for a time bomb. I have seen several people in the 100,000+ club, so that makes me feel a little better. 06 Top_Banana, Sorry about your bad experience though.
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2008 Srt8 Super Bee #178 of 1000.