More than just a better material, we have custom tailored our heat treat process to gain every advantage possible. At Oliver we use a special two stage heat treatment. The first stage is designed to “grow” the absolute best grain structure possible, critical for cyclic durability in use. In a 10,000rpm engine, the connecting rod goes through 166 complete cycles every second! After we’ve fully machined our rods, we then send the machined pieces back out to heat treat. During this second heat treat stage the Rockwell hardness is increased up to an optimal level of 38-41, a 20% improvement over our competitors. This process is specific to Oliver rods and custom tailored to get the highest performance from our material. The result is a connecting rod with higher ultimate tensile strength and yield strength.