From daily drivers and heavy-duty tow rigs to full-blown drag strip builds, these springs are engineered to handle everything from mild upgrades to wild performance.

Unlock the full potential of your Cummins engine with the Performance Diesel Worx Big Boost Valve Spring Kit, engineered for superior performance, durability, and reliability. This complete drop-in package delivers 103 lbs. of seat pressure and 176 lbs. of open pressure at 0.420″ lift—making it the ideal choice for trucks running upgraded performance cams or operating under demanding conditions.

Built with exclusive “Pressure Tower” conical spring technology and paired with ultra-light billet retainers, this kit offers the highest strength-to-weight ratio available. The result? Better valve control, reduced valve float, and long-term reliability whether you’re daily driving, towing, or pushing your truck in competition.

Designed to handle up to 75 PSI of Big Boost, these springs maintain consistent performance even under extreme conditions. Heat-treated spring shims are available to fine-tune seat pressure for varying boost levels.

Why Choose Performance Diesel Worx?
Because when it comes to protecting your investment and pushing performance safely, every detail matters. This spring kit is crafted with precision, built to handle abuse, and designed to keep your Cummins running strong.

NOTE:

For 1998.5–2002 Cummins, some models have tighter valve spring pockets, a Pocket Cutter Tool (Sold Separately) may be required to ensure proper fitment.