I do not know of any tables or charts for crankshaft stress versus engine torque, it is a pretty complicated calculation typically done with high power 3-D stress analysis.
Regarding engine RPM, I do not believe you are hurting the engine, by using aluminum pistons instead of the original cast iron pistons, you have probably reduced the reciprocating weight by 25% and reduced the inertia load on the rods by 50%. This is very beneficial to rod and rod bearing life. You have offset this benefit some with a 10% increase in RPM, but you are still to the good.
There a few Massey 44 in the pulling word that are bored and stroked and run 30% over on RPM, with very few issues, if that makes you feel any feel any better.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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