Comp Cams Beehive valve spring kit is rated to hold the most power in the 7.3L Powerstroke, . The "beehive" design hold more seat pressure to handle high horsepower engines and prevent valve lift due to excessive boost pressures or rpm. This is the strongest valve spring kit available for 7.3L Powerstroke diesels and will make a great upgrade to you high performance engine. You can expect nothing but Quality and reliability from Comp Cams and we recommended this upgrade for 275cc and higher injectors or any applications you would need to turn a higher rpm. For high boost or competition applications.