A question for the engineers or metal experts. Can I safely powdercoat an aluminum valve cover, intake manifold, and turbo crossover?

My powdercoat guy is concerned that the heat will weaken the aluminum and warp it. He said he'd do it for me but at my own risk.

The powdercoating line is an industrial line at a factory, they just coat my parts in a mini booth by hand and throw them on the conveyor to bake. The parts bake at like 400 degrees for 18 minutes.

Would this damage my parts? I only have so many 603 parts haha.