We provide a variety of specialized services designed to optimize your cylinder heads for peak performance, whether you're restoring or upgrading. Below are the services available for 1000whp+.

Power Pak 2

Our Power Pak 2 includes premium parts and expert services to elevate your S55 combo.

Included Services and Parts:

  • We Use Your Supplied Cores: Fresh reliability and performance
  • GSC Power Division Valves: Stock size for long-lasting durability and optimal airflow.
  • GSC5091 Conical Spring Kit with HG shim: Provides superior valve control.

Services Include:

  • CNC Porting: Complete disassembly, thorough cleaning, and precision CNC porting.
  • GSC Power Division Bronze Guide Installation: Includes installation of new bronze guides and seals for enhanced durability.
  • HG Precision Valve Job: Restores proper sealing and increases airflow!
  • Milling: Provides a perfect finish for proper sealing.
  • Professional Assembly: Expertly assembled to ensure reliability and top-tier performance.

Power Pak 2 delivers unmatched performance and reliability giving you confidence in every mile or track pass for 1000whp+. Contact us to get started!

Click to Complete Power Pak 2 Inquiry

Aftermarket Refresh

Our S55 Aftermarket Refresh service ensures your aftermarket valvetrain is optimized for peak performance. Here’s what’s included:

Included Services:

  • Disassembly & Inspection: We carefully disassemble and inspect every component.
  • Spring Height Check: Verification of your aftermarket spring kit’s height for proper functionality.
  • Valve Inspection: Detailed assessment of all your aftermarket valves.
  • Valve Job Touch-Up: Precision adjustments to improve sealing and flow.
  • Milling & Assembly: A fresh sealing surface and professional reassembly.

Important Notes:

This service is subject to compatibility. If the valvetrain components in your cylinder head do not meet our specifications for safe and reliable operation, we may decline assembly to ensure quality and performance standards.

Give your S55 the refresh it deserves. Contact us today to learn more!

Click to Complete Aftermarket Refresh Inquiry

Pocket Port R: Power Where It Counts

Not every build needs a full port job—that’s where our Pocket Port R comes in. Designed for those looking to keep it efficient, reliable, and responsive, this CNC service focuses on the critical area under the valve and short side radius, where airflow gains matter most. We also include combustion chamber reshaping to help you run more timing, reduce EGTs, and unlock a more durable setup under boost.

⚠️ Important: This service is only recommended for customers running a dual-fuel setup (port + direct injection). The reshaped chamber is not compatible with DI-only configurations.

Click to Complete Pocket Port R Inquiry

CNC Port

At 1000whp+, the CNC Port is a great go to option. Expect gains of up to 100whp in the mid-range. Not only does it enhance your power curve, but it also results in faster spool times. Make more power at a lower boost level which adds reliability to your setup.

The Benefits:
More area under the curve, allowing you to make power at lower, safer boost levels—keeping your setup efficient, reliable, and performing at its best.

Services Included:

  • CNC Porting: Disassembly, cleaning, and precision CNC porting to optimize airflow.
  • GSC Power Division Bronze Guide Installation: Expert installation of new bronze guides and seals for added durability.
  • HG Precision Valve Job: Restores sealing and improves airflow for consistent performance.
  • Milling: Precision-machined for a flawless surface finish and proper sealing.
  • Professional Assembly: Expertly assembled to ensure peak reliability and performance.
Click to Complete CNC Port Inquiry

Not All Parts Are Created Equal—Here’s How We Pick the Best for Your Build!

Why Aftermarket Valves Are Essential

At this power level, upgrading your OEM valves is a must! Aftermarket valves are built with high-strength materials designed to withstand the extreme heat and stress of high-performance applications. While aftermarket valves may bend under extreme conditions, OEM valves are more likely to break—making aftermarket valves the safer, more reliable choice.

*Valve upgrades are not available with OEM valve guides

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Spring Pressure Considerations

A common concern when selecting a spring kit is adding too much spring pressure, particularly for street applications. However, when it comes to spring pressure, more is generally better than less. Insufficient pressure can lead to valve float, which can cause significant damage to your engine. Proper spring pressure ensures stable valve control and prevents potential issues at higher RPMs.

Importance of Correct Valve Spring Pressure

The right amount of spring pressure ensures the springs remain controlled, which in turn keeps the valves functioning properly. The number one cause of valve-train or cam/bucket failure is using the wrong valve spring for your application. If the valve spring isn’t up to spec, nothing else in the system will perform at its best. Proper spring selection is key to maintaining reliability and preventing costly damage.