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 700whp+.

Power Pak 3

Maximize Your Subaru's Performance

Our Power Pak 3 includes premium parts and expert services to elevate your combo.

Included Services and Parts:

  • New Cores: Fresh reliability and performance with brand-new OEM components.
  • New OEM Buckets (Lifter/Follower): Ensuring precise valve operation and durability.
  • GSC Power Division Valves: Stock size for long-lasting durability and optimal airflow.
  • GSC5073 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!
  • Cam Clearance to Head: Precision clearance setup for cam-to-head fitment.
  • Bench Lash to Cams: Precisely set to HeadGames specifications for optimal operation and performance.
  • Milling: Provides a perfect finish for proper sealing.
  • Professional Assembly: Expertly assembled to ensure reliability and top-tier performance.

Power Pak 3 delivers unmatched performance and reliability giving you confidence in every mile or track pass for 700+whp. Contact us to get started!

Click to Complete Power Pak 3 Inquiry

Aftermarket Refresh

Our Subaru 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.
  • Lash Adjustment: Set to match your aftermarket camshafts perfectly.
  • 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 Subaru the refresh it deserves. Contact us today to learn more!

Click to Complete Aftermarket Refresh Inquiry

Pocket Port

If you’re making 700whp-800whp, a full port is a want not a need. That’s why we created the Pocket Port, a cost-effective solution that focuses on reshaping and resizing the critical valve pocket areas to enhance flow where it matters most.

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

Services Include:

  • CNC Pocket Porting: Disassembly, cleaning, and CNC precision porting to optimize flow.
  • GSC Power Division Bronze Guide Installation: New bronze guides and seals expertly installed for enhanced durability.
  • HG Precision Valve Job: Restores sealing and maximizes airflow for consistent performance.
  • Cam Clearance to Head: Precisely adjusted for a perfect cam-to-head fit.
  • Bench Lash to Cams: Lash calibrated to HeadGames specifications for peak operatio
Click to Complete Pocket Port Inquiry

CNC Port

At 800+whp, the CNC Port is your only option. Expect gains of up to 140whp in the mid-range while maintaining the same peak power. Not only does it enhance your power curve, but it also results in faster spool times and 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 Pocket 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.
  • Cam Clearance to Head: Adjusted to ensure perfect cam-to-head fitment.
  • Bench Lash to Cams: Lash calibrated to HeadGames specifications for optimal operation.
  • 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.

Is Bigger Better?
Not in this case! We don’t install oversized valves in Subaru engines because they’re unnecessary. In fact, we’ve achieved 1400whp on stock-size valves.

Fun Fact: If your cam has less than 10mm lift, oversized valves can actually reduce performance. Bigger isn’t always better—it’s about using the right components for maximum efficiency and power!

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.

Buckets (Lifters) and Wear

Buckets (also known as lifter or follower) are considered wearable components. The unique oiling design of the Subaru boxer engine makes them more prone to wear, as the head is the last the to receive oil, in a resulting in less lubrication and greater wear over time or during a failure. Proper replacement is essential for optimal performance and longevity.

Bucket Replacement After Engine Failure

If you’re purchasing new heads due to a recent engine failure, it's highly likely that your buckets will need to be replaced, especially if you're upgrading to a new cam. Upgrading the cam often demands additional attention to the valve-train components to ensure optimal performance and prevent further issues.

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 1100whp, we recommend sticking with GSC Power Division S2 cams, they are the perfect upgrade. We recommend GSC Power Division S3 cams for anything above 1100whp.

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!