I know that 6.70's are generally the rule of thumb for most customs but some of my favorite cars used to run 7.10's. Examples like the Sam Barris Merc Or how about the Valley Custom's Polynesian Both of these cars ran the massive 7.10's and I love the way it looks. Is it an option for lets say a '54 Chevy done in the same manner? Why do they look so great on these cars and why am I restricted to 6.70's? Any examples on contemporary cars or historic cars would be great!