Max heat

Define Damage.
I find 150 deg C at the head is a safe temp.
at 180 deg C. I start to see some stain under the piston crown.
I believe 200 C is about as hot as you would ever want to get your motor.
 
That's about 300° F for normal , 400° is the high end. I take Theon's word on this, I've never checked any of mine.
 
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