My, you ARE a bundle of joy. I was referring to Brad's post (#20) where he refers to 500 deg, or couldn't you read that far back?
You are correct, I am not a mechanic. Well, not any more as I'm 73 and retired.
But have the qualifications as Petrol and Diesel Mechanic.
FYI, way back in the '70's I was serviced trained on Jaguar/Rover/Range Rover/Land Rover by British Leyland (Aus/NSW). And was the senior mech at the Hobart dealer. Went on to run my own w/shop employing 4 mechs and servicing more British cars than the local dealer.
Eventually sold that business along with the 2 Service Stations I had in Hobart.
Last 30 yrs prior retirement was as senior Product Support Mngr for the largest Earthmoving machinery distributor in Tasmania.
Currently I am a good friend of one of the senior Jaguar/Range Rover/Land Rover mechanics at the local Hobart Dealer, and he tells me they have no knowledge of exhaust manifold warping problems to the R/Rovers or L/Rovers. It would appear this problem only occurs on certain engines which have been "chipped" by some spurious chippers. Hence the reason why I "dared" to say that I have not heard of the warpage problem. I was referring to stock vehicles. I think that many of us know who the spurious chippers are..........
....and I must apologise to you, I did think it was at half engine speed, but must confess that at my age my hearing is not so good these days. It certainly did not sound like the typical run big end. Had it shown the consistent typical big end knock, then I guess we all would have jumped onto the problem far sooner.
You are obviously a highly competent mechanic with vast experience on these vehicles.
Sorry to disagree, but an EGT of 450 degrees is 450 degrees full stop, regardless of all the parameters you mention. Are you trying to say that hypothetically 1,000 deg EGT is meaningless and nothing to worry about unless you know all the parameters?

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