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post #11 of 14 Old 01-01-2013, 07:03 PM
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Originally Posted by Jonny View Post
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 ...

Previous : '07 Charger R/T AWD, heads/cam, full JBA exhaust, 6.1 injectors, a few other things. 355 AWHP, 370 AWTQ
Mine: '13 Mustang GT, SterlingGray, 6-spd man, Recaros, Track Pk, 2.3L Whipple, 541 RWHP, 478 RWTQ
GF's: '08 Mustang GT500, White/blue stripes, '13 TVS & injectors, FRPP twin-65mm TB, JLT 123mm CAI, 643 RWHP, 608 RWTQ
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post #12 of 14 Old 01-02-2013, 05:50 AM
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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.

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post #13 of 14 Old 01-02-2013, 09:44 AM
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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.

07 R/T, Spoiler, Daytona Insert, Glove box light, Mopar Fender CAI, Hood struts, Cabin Air Filter
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post #14 of 14 Old 01-02-2013, 12:14 PM
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Originally Posted by Scott View Post
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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