ORIGINAL: Broken Wings
ORIGINAL: Sport_Pilot
To do any real heat treating you are going to have to get the engine up to over 500 degrees or a lot more. There is no heat treating effect at the temperatures our engines operate at.
How soft do you want it?
You have absolutely no heat treating effect in our engines at the temperatures they operate at. The lowest temp is for tempering which is around 600 degrees F or so. The only exception is some aluminum alloy's age harden at roomtempwhich is complete when you recieve the product, and if notwould happen regardless of running your engine.