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 S58 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: Provides superior valve control.
  • GSC Power Division S2 Cams: create more power and torque across the entire RPM range.

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 S58 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 S58 the refresh it deserves. Contact us today to learn more!

Click to Complete Aftermarket Refresh Inquiry

Pocket Port R

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 a proper upgrade the safer, more reliable choice.

At HeadGames, we only use GSC Power Division valves. Why? Because we’ve installed them all, flowed them all, and tested them beyond the limits. Time and again, GSC valves deliver unmatched durability, airflow, and performance—they’re the best in the business, and we won’t settle for anything less for our customers.

GSC Power Division is more than a parts supplier—they’re innovators who share our obsession with precision and performance. When you're chasing real horsepower, GSC is who you want in your corner.

*Valve upgrades are not available with OEM valve guides

Spring Pressure Considerations

Not all valve springs are created equal. In fact, we’ve tested just about every spring on the market—and most of them miss the mark. Some setups don’t even balance the intake and exhaust properly. Others are barely stronger than OEM, and a few just straight up can’t handle real boost.

When you're dealing with 30+ psi, you need more than marketing hype—you need real spring pressure, correct seat and open values, and a spring rate that doesn’t back down when the RPM climbs.

That’s why we only use GSC Power Division valve springs. Out of every brand we tested, only two even made the cut for boost beyond 30 psi, and only one had the seat pressure, open pressure, and spring rate to throw the kitchen sink at it. GSC’s spring kit isn’t just the best—it’s the baddest dude on the block.

We trust it because we’ve pushed it. If it’s not GSC, it’s not going in your head.

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.

Choosing the Right Camshaft

Planning to relax in a lawn chair and listen to your car? If so, you might be tempted to go for the biggest cams on the market, and while it’ll certainly make your car sound great, it could also make it feel laggy. A camshaft that’s too large can deliver the sound you’re looking for but at the cost of drivability, especially in terms of throttle response and power delivery. Choose a cam that matches your performance goals for the best balance between sound and feel.

The Best Cam for Your Boosted Adventures

If you love pushing your car to its limits and diving into boost on the street, a smaller cam is the way to go! For up to 1500whp, we recommend GSC Power Division S2 cams, they are the perfect upgrade. We recommend GSC Power Division S3 cams for anything above 1500whp.

These cam choices deliver plenty of area under the power curve, ensuring smooth, reliable performance that keeps your car pulling hard and your smile wide for miles of boosted fun!