Driving Innovation In Diesel Performance

Stage 1 Heads. Built for Cummins.

Stage 1 reman heads for 5.9L & 6.7L applications. Upgraded with 105 lb valve springs and a precision 5-axis CNC port job.

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From $3,149.99
1998 - 2002 ISB Stage 1 24v Cummins Performance Head

1998 - 2002 ISB Stage 1 24v Cummins Performance Head

  • 105 lb valve springs for improved valve control
  • 5-axis CNC port job with factory intake plenum retained
  • Thread-in soft plugs for added reliability
  • Intake flow improvement referenced from ~155 CFM to ~220 CFM
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From $3,149.99
2003-2007 5.9 CR Stage 1 Cummins Performance Head

2003-2007 5.9 CR Stage 1 Cummins Performance Head

  • 105 lb valve springs for improved valve control
  • 5-axis CNC port job with factory intake plenum retained
  • Thread-in soft plugs for added reliability
  • Intake flow improvement referenced from ~155 CFM to ~220 CFM
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From $3,149.99
2007-2018 6.7 Stage 1 24v Cummins Performance Head

2007-2018 6.7 Stage 1 24v Cummins Performance Head

  • 105 lb valve springs for improved valve control
  • 5-axis CNC port job with factory intake plenum retained
  • Thread-in soft plugs for added reliability
  • Intake flow improvement referenced from ~155 CFM to ~220 CFM
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From $3,244.99
2019+ 6.7 Stage 1 24v Cummins Performance Head

2019+ 6.7 Stage 1 24v Cummins Performance Head

  • 105 lb valve springs for improved valve control
  • 5-axis CNC port job with factory intake plenum retained
  • Thread-in soft plugs for added reliability
  • Intake flow improvement referenced from ~155 CFM to ~220 CFM
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What's Inside the Stage 1 Head

D&J Stage 1 High Performance Cummins Heads are in a class of their own.

KNOWLEDGE HUB

Everything you need to know about D&J Cummins stage 1 cylinder heads.

Stage 1 is ideal for daily drivers, towing, and performance builds that want lower EGTs and improved low-end response. The 5-axis porting is designed to keep the factory intake plenum while increasing intake flow (commonly referenced from ~155 CFM to ~220 CFM), which can reduce boost demand and help the engine run cooler under load.

  • Stage 1 Power Without Aftermarket Intake Gains airflow and response while keeping the factory intake plenum for simpler installation.
  • 5-Axis CNC Porting Precision port work designed to improve intake flow and efficiency while retaining the factory intake shelf/plenum.
  • 105 lb Valve Springs Added spring pressure for improved valve control in higher-demand towing and performance setups.
  • Lower EGT Potential Increased airflow can reduce boost demand and help lower exhaust gas temps under load.
  • Pressure-Tested & Crack-Checked Inspection and pressure-check steps help confirm integrity before shipping.

FAQs

What is a Stage 1 Cummins cylinder head?
Stage 1 builds on a performance reman head and adds 105 lb valve springs plus a 5-axis CNC port job while retaining the factory intake plenum.
What engines do your Stage 1 heads fit?
Stage 1 heads are available for specific year ranges including VP44 24V (1998–2002), 5.9 CR (2003–2007), and 6.7 CR (2007–2018 and 2019+).
Do Stage 1 heads require an aftermarket intake?
No, Stage 1 porting is designed to retain the factory intake plenum for easier installation and strong drivability.
How much airflow improvement does Stage 1 add?
Stage 1 porting is commonly referenced as increasing intake flow from around 155 CFM stock to about 220 CFM (varies by setup).
Will a Stage 1 head help lower EGTs?
Yes, improved airflow can reduce boost demand and help lower EGTs under load.
Is Stage 1 good for towing and daily driving?
Yes, Stage 1 is a strong choice for towing and daily use because it improves low-end response without complicating the intake setup.
What valve springs come on Stage 1 heads?
Stage 1 heads include 105 lb valve springs for improved valve control.
Are thread-in soft plugs included?
Yes, Stage 1 heads include thread-in soft plugs installed under the valve cover where applicable.