I don't know. What I do know is that the gassers shift down, and rev higher, causing the exaust gasses to get much hotter. Transmission also gets a lot hotter. Everything gets much hotter. When I pull hills (Now I'm talking towing here) with a gasser, I can smell the heat, and hear the metal expanding/contracting. Transmission temps reaching 200*+, and that's not pushing it. It's the heat that is the killer. I can't believe GM (or any others) are making a gasser that won't get HOT towing hills. My diesel shifts up pulling the same hills, with the same loads. Transmission temps are around 130* - 140*. No hot smell, etc.. A night & day difference. It will float up the hills, not shift down & rev. Why do you think the choice for big rigs is diesel? Diesels rev less, run cooler, and have way more torque. EXAMPLE: A GM 6.0 has around 350 foot pounds of torque. My 2011 Duramax has 765 foot pounds of torque. That's more than double the torque. A diesel engine will out live a gasser 3 to 4 times. They get better milage than a gasser doing the same job. The fuel cost more now, so that's kind of a wash.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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