Oliver I-beam connecting rods feature exclusive "Parabolic Beam" designs that reduce beam stress and deliver the highest strength-to-weight ratio of any connecting rod currently made. All rods are precision machined using only E4340 chrome moly alloy billets, heat treated to produce a 100% martensite grain structure. Intense inspection, statistical process control, batch sampling, fatigue cycle testing and customer feedback have created a design and manufacuring environment that produces one of the best connecting rods available in the world. These Oliver rods are perfect for VERY high horsepower and HIGH RPM street or racing engines up to 1500 plus horsepower. Manufactured for the Modular Ford engines these rods are: