Also race gas will have some lead in it too, i know at least c-16 does, but im guessing the chances of u being around any 5.0 built to run off that stuff will be pretty slim, but 4cyclynder turbo buddies run that shiet all the time so they dont blow up and so they can keep up with the big dogs, I spent a day around a car running that tho being tuned in a dyno shop and drivin around it all nite and never has any fume from a car given me such a headache!!!!