6.1 Hemi into 72 Demon March 2018

Why would it not? Powder will adhere to any metal -- it's all in the prep and gun settings to get the best results and adhesion. Aluminum can be tricky though (especially old used cast pieces) so those are best left to the pros.
I am for sure leaving it to the pros! anyone has any ideas on painting or coating the plastic valve covers let me know, I have searched and not really found any replacement dress up pieces? I am going to take a break for a week or so and go see a bunch of hillbillies and rednecks in Arkansas and Oklahoma! Oh wait that is my family! Hah! We have a new grandson who I figure desperately needs a fine pump 12 gauge for a birthday present! Hope all y'all have a great week and weekend! And remember....as my boss once upon a time sat at his desk shaking his head told me "there is nothing worse than an articulate redneck" be safe see ya in a week!