These Rods are Wissota Legal and are approved for Super Stocks, Midwest Mods, and Street Stocks. When it comes to H-Beam connecting rods, not all are created equal. Manley's H-Beam Series stands out as a superior choice, offering exceptional quality at an economical price point. These connecting rods are meticulously crafted to meet the same high-quality standards as our renowned Sportsmaster? and Pro Series rods. They are the ideal weight and strength for Wissota engine classes, and include 3/8" ARP 2000 cap screws. These pair perfectly with the Wissota legal Manley crankshaft and platinum series flat top pistons. Bulletproof your Wissota engine bottom end with a complete Manley Rotating Assembly!