I can't believe this isn't blowing up. If you plan on ever building a motor, these are a necessity if you want to spin over 7500, or make 275whp plus. I'm not an engineer, but apparently higher rpm and more power causes crank deflection and causes the oil pump drive gears to grenade because they're made of sintered iron, not solid metal. I believe the only other oil pump gear option is $500+, but can't find the link.