BMW B58 up to 1000whp

Power Pak 1

Maximize Your B58'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. Best valve spring on the market.

Services included:

CNC Pocket Port: Includes disassembly, cleaning, CNC Pocket Port, GSC bronze guide installation, precision valve job, milling, and professional assembly.

Power Pak 1 delivers unmatched performance and reliability for up to 1000whp. This package is designed to be used with an OEM or GSC S1 cam for ultimate performance in a streetcar. Contact us to get started!

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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!

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Aftermarket Refresh

Our B58 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 B58 the refresh it deserves. Contact us today to learn more!

Click to Complete Aftermarket Refresh Inquiry

Rebuild

Restore and Enhance Your B58'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!

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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

Valve Upgrades

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.

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 1000whp we recommend you sticking to the OEM cams. 1000whp+ GSC Power Division S1 cams are the perfect upgrade up to 1400whp then move onto the GSC S2 cams.

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!