As cylinder pressures, springs pressure and rpm increase, the stress on your factory pushrods increases far beyond the level of stress your factory pushrods were designed for. If you are above 750 HP with your ISB you need to upgrade to the extreme duty pushrods. If you are over 750 HP with your ISB, the cylinder pressures dictate that you step up to our extreme duty pushrods which consist of a 3/8? .095? wall intake pushrod and a 7/16? .120? exhaust pushrod.
**If you need valve springs and pushrods we also have a package deal from Hamilton Cams for 103lb Valve Springs + Heavy-Duty Pushrods or Extreme Duty Pushrods + a FREE valve spring tool. Please contact customer service to ensure correct fitment on your truck: (216) 408 6455**