S55 up to 1000whp

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 up to 1000whp.

Power Pak 1

Maximize Your S55's Performance

Our Power Pak 1 includes premium parts and expert services to elevate your combo.

Included Services and Parts:

We use your supplied core: Cleaned and inspected with reliability and performance in mind.
GSC Power Division Valves: Stock size for durability and optimal flow.
GSC5091 beehive spring kit Superior valve control under street driven conditions.

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.
Milling: Provides a fresh sealing surface.
Assembly: Includes brand-new Viton valve seals for long-lasting reliability.

Power Pak 1 delivers unmatched performance and reliability for up to 1000whp. This package is for ultimate performance in a streetcar. Contact us to get started!

Click to Complete Power Pak 1 Inquiry

OEM Refresh

Restore Your Cylinder Head 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.
Milling: Provides a fresh sealing surface.
Assembly: Includes brand-new Viton valve seals for long-lasting reliability.

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

Click to Complete OEM Refresh 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

Rebuild

Restore and Enhance Your S55's Cylinder Head

Rebuild Service is the ultimate solution for worn-out valve seats or aging components, ensuring your BMW B58 head performs better than new. Here’s what’s included:

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.
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.
Motorworks specifications for peak operation.
Milling: Providing a fresh sealing surface.
Reassembly: Your cylinder head is 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 up to 1000whp Builds

If you’re making less than 1000whp, 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.

Services Include:

CNC Pocket Porting: Disassembly, cleaning, and CNC porting the area under the valve and short side radius 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.
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

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

Valve Upgrades

We often get asked why we don’t offer oversized valves for the BMW B58 cylinder head. The answer is simple: oversized valves do not fit on the OEM valve seats.

The reality is the factory port design doesn’t support a larger valve and the oversized valve physically doesn’t fit the seat properly. You’re left with a valve that’s bigger than the seat it’s trying to seal, which compromises durability, sealing, and reliability.

At HeadGames Motorworks, we focus on what works—not what looks good on paper. Proper valve sizing keeps flow optimized, seats intact, and power where it belongs: under your right foot!

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.