2 more cents worth; hey what would you folks think if I told you we owned a SBC that turned 10,000 RPMs with standard 1957 type pulleys and a commercial grade Gates v-belt !!! No, my eyes aren't brown this Modified stock car won a championship at a local track it even won 3 races a night for eight straight weeks. Ok enough of the soap box; about 10 or 15 years ago Hot Rod magazine and a few others did stories on serp. belt systems and said that you gain between 3-15 horse power. Some of you may have the articles in a stack of old magazines. I personally am running v-belts for now, but you know they do have deep groove pulleys for high RPM !!!
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