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Endurance Plus Roller Lifters feature Isky's revolutionary new TruTrac long life precision roller bearings. Sprintron test proven over 1,000 racing miles, TruTrac bearings are distinguished by the following Isky exclusives: New 30% stronger Super Clean Timken Steel specifically designed for needle roller bearings. New .755" dia. "Parabolic" Profile Crowned outer bearing race corrects for block misalignment by optimising cam lobe contact. New Non-Skid Textured finish is test proven to improve bearing life by reducing slippage & lowering oil temperatures! New Stronger 4340 heavy duty pin.