Low carbon steel (which is what the engine mount brackets are likely made of) can be heated red hot multiple times without really affecting strength, except that a little of the surface might flake off each time they're heated/cooled. Low carbon steel really can't be heat treated either, it takes a higher carbon content to harden steel, and high carbon steel can be tempered afterward to remove brittleness.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.