According to this it should be 0.120 wall thickness
http://www.hotrod.com/techarticles/nhra_legal_rules_regulations_time_brackets/index.html
wrong kind of metal bro...this is the kind with a seam inside...
According to this it should be 0.120 wall thickness
http://www.hotrod.com/techarticles/nhra_legal_rules_regulations_time_brackets/index.html