I've been trying research it, and just about all the test data I've read states the contrary. The best powdered-metal gears are rated at 25% less overall strength then the best heat-treated steel gears. The surface-hardness is sometimes equal though. And note, I cited tests on the best of both types. I have NO data on what GM uses in their steel or their powdered metal gears. From what I've read, the powered-metal gears save machining time and waste and tend to be more perfectly formed then machined gears. I've yet though to find anything that shows them as stronger, or even equal.
Note I'm not disputing what you say. I'm fully admiting I don't know and am trying to research.
Obvisously, I have no way of determining any of this myself. So, I've got to believe what I read.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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