1989-1998 Cummins 5.9L Hamilton Cams HD Valve Springs (07-s-001)

Upgrade your 12-valve Cummins valvetrain with our Conical Beehive Valve Springs, delivering 155 lbs of seat pressure to keep valves firmly under control up to 4,500rpm RPM or 65lbs of boost/drive pressure. This conical design offers enhanced stability for moderate cams and OEM-size valves, all the way up to 4,500 RPM.

Why Conical Beehive Springs?

• Improved Valvetrain Control: Reduce valve float and reversion, critical issues when boost and RPM levels rise.
• Power-Boosting Potential: Customers have reported 10–12 HP gains when switching from 60 lb springs to our beehives, thanks to consistent valve seal and reduced reversion.
• Higher Seat Pressure (155 lbs @ 1.880″): Ensures valves won’t be forced open by intake or exhaust pressures, safeguarding against damage and power loss.
• Conical Shape for Stability: The latest spring design improves harmonic damping, leading to smoother, more reliable operation at higher RPM.

What’s Included

• Retainers & Locks: Ready to install for most 12-valve Cummins configurations.
• Optional Locks: Increase your installed height by .075″ if needed for specific build requirements.

Installation & Considerations

• RPM Range: Perfect for builds up to 4,500 RPM with mild-to-moderate cam profiles and stock-size valves.
• When to Upgrade: If you exceed 4,500 RPM or .360″ lift aftermarket cams, or use larger valves, consider stepping up to our Dual Spring kit for added safety and control.
• Combat Valve Float & Reversion: Keep harmful exhaust gases out of the intake stroke, preserving combustion quality and maximizing power.

Elevate your 12-valve Cummins performance with our Conical Beehive Valve Springs (155 lbs seat pressure)—an essential upgrade for improved reliability, consistent power, and better valvetrain durability under demanding conditions.