Red Zone roller lifters feature the new Marathon Roller Bearings. These bearings utilize a larger diameter pin and a shock absorbing thicker outer race for higher fracture toughness! Marathon Bearings withstand higher (up to1/2 ton) spring loads, delivering over twice the number of runs between rebuilds! Exclusive Full Spectrum 3 Point Oiling System features continuous dual action pressurized lubrication at all times to the roller bearings and an extra shot of oil over the nose of the cam where loads are greatest.