91W350
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Detroit did pour a lot of money into development of the engines. They could not withstand high rpm continuous running. The main bearing webbing cracked and the bearings got loose. They tried a new alloy block for the 6.5 engines, thinking that would solve the problem. It did not. At the time they were chasing fuel economy, not towing power. Dodge really upset the apple cart in 1989 with the Cummins. They had power and they had economy and they would run a million miles wide open. Okay, so wide open was only 2650 rpm or so then... At any rate, it did not take GM long to figure out the 6.5 engines we're not going to compete. They went outside to Isuzu and the Duramax. The 6.2 and 6.5 engines were never intended to be run like we run diesels now. Sure, a highly modified engine can for a short time. I loved to hear my 427 at 7500 rpm, but I did not expect it to live there for hours on end.
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