Your piston and crank might be ok but aluminum is pretty fickle stuff it doesn't take much heat to mess it up. I wanna say heat treat for aluminum is around 600*
I agree shop teachers are just good people. They had a different view on kids and could tell who was worth a damn. My senior year I engineered my schedule so I had 6 1/2 hours of study hall every other day and I spent all of that time in shop ( metals and auto ) working on my Jeep cj5.
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