Most of the 'workers' in the Spartanburg plant are state of the art robotics with a near zero error tolerance.

I suggest doing some troubleshooting before deciding your problem has anything to do with the valve train. There is a long list of other potential causes with a higher % of likelihood.

My guess is that if the vehicle was worth $3,500 that would have been the price. I'm surprised the engine even ran for $150. I'd say your cost of ownership for 1,400 miles is very low and you can sell some parts and then scrap it for a tidy profit to buy a 528.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas