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The 6.9's required a "re-torque" at 30,000miles or so after leaving the factory. People who failed to do so are now experiencing mass head gasket failures at 200,000miles or so. Ive seen 6.9's in industrial and commercial use that have never had any head gasket issues and are pushing ridiculous amounts of miles now...the heads were all re-torqued as required.
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Couldn't agree more, same applies to the 7.3's. Years back a Ford heavy truck shop foreman told me the very same thing. They didn't deal with diesel pickups, but had to work on some since some of their truck fleet owners had 7.3/6.9 pickups. I retorqued mine at 30,000 when I installed my ATS kit and took note that each bolt took up an additional 1/4 turn past the original wrench position after I cracked it loose and retorqued.
