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Have they done a bore inspection through the plug holes at least?
Are any valves bent? (a visual inspection as they do not close.)
A compression test? (Yes, I get it if the timing is way off the reading will be meaningless)
If the answer is NO, then I would get a second opinion like you would from a doctor before moving forward with any surgery. Testing before hand will provide a good guess on what happened. As it may be a case of retiming and restarting.
The valve seal replacement on a 4.8is does NOT require head removal. Based on the price they are planning a chain/timing attack followed by a general engine seal job and some valve stem seals, which if I am not mistaken requires the chain to be taken off anyhow.
A second shop might be a good thought. Recommendation: Martin Motorsports in Alex VA. Worth the tow bill after a consultation with Gary on the phone. Call him.
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2005 X5 4.8IS
The Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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