This man speaks the truth.

Choose your chrome wisely.

 

I've got the entire motor chromed with covers. No problems. No heat issues. Been in all temps up to 103 in Wyoming, 95 climbing Mount Washington, stop-and-go traffic so hot I had to stand up off the seat because the x-over pipe was cooking my legs. No issues. No problems. I use synthetic oil, it's all been fine.

Cannon

 

I have plenty of covers on mine and and have no trouble. I'm sure you would have to to have some really fancy heat measuring equipment to tell any difference.