I've been checking out connecting rods for my engine and I came across thishttp://www.OldMiniBikes.com/?target=product&product_id=32297 it says its a performance cast rod from arc. Has anyone used thisk? are they worth anything? How many rpms will it hold up too? They are a whole lot easier on the wallet than the $85 rods so would this rod work for around 6k rpms? I have searched high and low about this thing and haven't found a thing about it