Diamond has announced a line of pistons for the highly popular big-block Chevrolet Sportsman racing engines. Known as their Competition Series, they are suitable for most 24- or 26-degree valve angle big-block cylinder heads. As expected, they cater to race engines in several favored classes, including Top Dragster, Top Sportsman and ET Bracket. The Competition Series pistons are created from the more shock-resistant 2618 aluminum alloy inboard forgings. In addition, they are lighter in weight than the conventional piston body, yet their inboard-style structure provides greater strength and as such accepts small to medium applications of nitrous. www.DiamondRacing.net