Federal-Mogul Motorparts has introduced a new series of Speed-Pro metric-sized piston rings. The rings help enhance the power and performance of oval track and drag racing engines by reducing rotating mass and cylinder wall drag, according to the company.

The new Pro-Metric series features than 70 part numbers including 1.2 x 1.2 x 3 mm, 1.2 x 1.5 x 3 mm and 1.5 x 1.5 x 3 mm ring pack configurations covering Chevrolet LS, Dodge Hemi and small-block Ford racing engines, according to the company. Each set features lightweight, high-strength stainless steel nitride or steel plasma-moly top ring; ductile iron second ring with Napier groove; and three-piece, patented curved-vent design oil ring with chrome rails. Sets are available in both conventional and file-fit designs.