FA20 – Headgames Motorworks

Subaru FA Power Pak

Maximize Your Subaru's Performance

Our Power Pak includes premium parts and expert services to elevate your combo. This package is available for 500-700whp and 700-900whp as a Pocket Port or Pocket Port R.

Included Services and Parts:

New Cores: Fresh reliability and performance with brand-new OEM components.
GSC Power Division Valves: Stock size for long-lasting durability and optimal airflow.
GSC5056 Conical Spring Kit: Provides superior valve control.

Services Include:

CNC Pocket Porting: Complete disassembly, thorough cleaning, and precision CNC pocket 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 delivers unmatched performance and reliability giving you confidence in every mile or track pass for 500-900whp. Contact us to get started!

Click to Complete Power Pak Inquiry

OEM Refresh

Restore Your Cylinder Heads to Like-New Condition

If you're restoring your car and returning it to stock, our Refresh Service is the perfect choice. Here’s what’s included:

Included Services:

Comprehensive Cleaning: We thoroughly clean your cylinder heads.
Valve Reconditioning: Cleaning and refacing of your valves to restore optimal performance.
Valve Seat Refresh: Ensures proper sealing and durability.
Lash Adjustment:HeadGames does not set lash on FA. This is to be completed by the customer on their engine.
Milling: Provides a fresh sealing surface.
Assembly: Includes brand-new Viton valve seals for long-lasting reliability.

With our Refresh Service, your cylinder heads will be restored to like-new condition, ready for years of dependable performance!

Click to Complete OEM Refresh 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: : HeadGames does not set lash on FA. This is to be completed by the customer on their engine.
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

Rebuild

Restore and Enhance Your Subaru Cylinder Heads Our Rebuild Service is the ultimate solution for worn-out valve seats or aging components, ensuring your Subaru heads perform better than new.

Included Services:

Inspection & Diagnosis: We assess valve seat wear and identify issues caused by insufficient spring pressure from OEM springs.
Comprehensive Cleaning: Complete disassembly and thorough cleaning of all components.
Valve Reconditioning: Cleaning and refacing of your valves to restore optimal performance.
Precision Valve Job: Performed on our state-of-the-art seat and guide machine for maximum sealing and flow.
Lash Adjustment: HeadGames does not set lash on FA. This is to be completed by the customer on their engine.
Milling: Provides a fresh sealing surface.
Reassembly: Includes installation of new Viton valve seals for lasting reliability. Experience a Rebuild That’s Better Than New. Contact us today to schedule your service!

Click to Complete Rebuild Inquiry

Rebuild w/ Guides

Required with Any Valve Upgrade

Upgrading your valves? Our Rebuild with Guides Service is essential to ensure proper valve-to-guide clearance and long-lasting performance.

Included Services:

Comprehensive Cleaning: We thoroughly clean your cylinder heads to prepare them for upgrades.
GSC Bronze Guide Installation: Installing high-performance GSC Power Division bronze valve guides and sizing them for perfect valve-to-guide clearance.
Precision Valve Job: Maximizing flow and ensuring optimal sealing.
Lash Adjustment: HeadGames does not set lash. This is to be completed by the customer on their engine.
Milling: Providing a fresh sealing surface.
Reassembly: Your cylinder heads are reassembled with care, ensuring peak durability.

This process guarantees years of reliable, high-performance, boosted power! Contact us today to upgrade your valves the right way.

Click to Complete Rebuild w/ Guides Inquiry

Pocket Port

Pocket Port: The Perfect Upgrade for 550-700whp Builds

If you’re making 500whp to 700whp, a full port isn’t just unnecessary—it can actually hurt performance by increasing port volume too much, reducing efficiency under the curve. 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. The runner stays stock.

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.
Lash Adjustment: HeadGames does not set lash. This is to be completed by the customer on their engine.
Milling: Provides a flawless surface finish for proper sealing.
Professional Assembly: Assembled with expert care for ultimate reliability and performance.

Click to Complete Pocket Port Inquiry

Pocket Port R

The Perfect Upgrade for 500-700whp Builds

If you’re making 500whp to 700whp, a full port isn’t just unnecessary—it can actually hurt performance by increasing port volume too much, reducing efficiency under the curve. That’s why we created the Pocket Port R, a cost-effective solution that focuses on reshaping and resizing the critical valve pocket areas to enhance flow where it matters most PLUS combustion chamber reshaping to rid of any hot spots.

The Benefits:
More area under the curve and the ability to make power at lower, safer boost levels, combustion chamber reshaping which raises the knock threshold, keeping your setup efficient, reliable, and performing at its best. The runner stays stock.

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.
Lash Adjustment: HeadGames does not set lash on FA. This is to be completed by the customer on their engine.
Milling: Provides a flawless surface finish for proper sealing.
Professional Assembly: Assembled with expert care for ultimate reliability and performance.

Click to Complete Pocket Port R Inquiry

Street Port

At 700+whp, the CNC Port is your only option. 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 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.
Lash Adjustment: HeadGames does not set lash on FA. This is to be completed by the customer on their engine.
Milling: Precision-machined for a flawless surface finish and proper sealing.
Professional Assembly: Expertly assembled to ensure peak reliability and performance

Click to Complete Street Port Inquiry

Valve Upgrades

If you choose to upgrade your valves, you will need at minimum our Rebuild with Guides Service. This is necessary because the stem size of OEM valves differs from aftermarket valves. Installing an aftermarket valve in an OEM steel guide can create excessive valve-to-guide clearance, which may cause premature guide wear.

If your budget allows for a valve upgrade, we highly recommend it. OEM exhaust valves are prone to burning, which can lead to significant damage—such as destroying the heads, turbo, or valve seats.

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.

Oversized Valve Flow vs. OEM Valve

We only install OEM-sized valves in Subaru FA. The valve seat functions as a heat sink, helping dissipate heat from the valve. Using an oversized valve in this application compromises the heat-dissipating properties of the valve seat, which can negatively impact performance and durability.

Oversized valves actually flow less than OEM-sized valves up to 9mm of lift. Consider this: most cams we install have around 10.5mm of lift, meaning you’re limiting flow for 90% of the cam’s lift range. In contrast, OEM-sized valves provide better flow where it's most needed, resulting in a greater area under the power curve. This translates to more consistent power, perfect for daily boosted performance and reliability!