The HKS Head Studs Kit Pro is a performance-grade, reinforced head stud set engineered for the Toyota GR Corolla’s high-output G16E-GTS engine. Designed specifically for high combustion pressure environments — such as high-boost, track, and built engine applications — this kit significantly strengthens the cylinder head clamping force and improves sealing integrity over the factory head bolts.
Head studs are a critical yet often overlooked upgrade when increasing boost pressure or running forged internals. Pairing these studs with a high-performance head gasket — such as the HKS Super Cooling Pro gasket — dramatically reduces the risk of head gasket leaks or head lift under extreme combustion loads.
Strong ARP Custom Age 625+ Material: Uses premium high-tensile fasteners crafted from ARP’s Custom Age 625 Plus material for excellent strength, fatigue life, and corrosion resistance.
Bottomed Type Stud Design: Studs thread deeper into the block, increasing active thread engagement and dispersing stress over a longer length for higher load endurance.
Improved Head Seal Security: Enhances head gasket clamping force — especially important when paired with high-compression or modified gasket setups like the HKS Grommet Super Cooling Pro.
Engineered for Forced Induction: Ideal for turbocharged builds with elevated boost levels and higher combustion pressures than stock.
Designed for G16E-GTS: Precision-engineered for the specific thread sizes and geometry of the GR Corolla’s three-cylinder turbo engine.
For engines pushing beyond factory power levels — especially in high-boost turbo or closed-deck builds — standard OEM head bolts can be a limiting factor in sustaining cylinder head sealing integrity. Under high combustion pressure and heat cycles, conventional bolts can stretch or experience stress concentration, reducing clamping force and risking:
• Head gasket failure
• Uneven sealing pressure
• Head lift
• Loss of compression
Upgraded head studs prevent these issues by maintaining consistent, high clamping load across combustion cycles, lowering the risk of leakage and increasing engine reliability under extreme operating conditions.
This head studs kit is ideal for:
High-boost turbo builds
Track and drag applications
Closed deck engine configurations
High-compression short block builds
GR Corolla engines that have elevated combustion pressures
When combined with a performance head gasket, these studs create a foundation capable of handling serious tuning potential.
• Includes high-strength head stud bolts designed to replace factory head bolts (M12 x4 & M11 x4 configuration).
• Designed for professional installation — proper torque sequence and plating lubricant recommended.
• Pair with a performance gasket and head bolts (if applicable) for best long-term results.
• Strongly recommended on all high-output engine builds to protect against head gasket failure.
Will this spec improve reliability on stock engines?
Yes — even on lightly tuned engines, upgraded studs provide a more consistent clamping force and better resistance to heat and pressure cycles.
Do I need this with the HKS Super Cooling Pro gasket?
Yes — because stronger studs help ensure the enhanced gasket maintains uniform sealing under higher combustion pressures.
Are these head studs reusable?
High-strength studs are typically reusable when installed and removed properly under correct torque procedures.
Will this improve horsepower?
Not directly — but it supports higher boost and safer tuning by improving sealing reliability.
Part #22999-AT001
The HKS Head Studs Kit Pro is a performance-grade, reinforced head stud set engineered for the Toyota GR Corolla’s high-output G16E-GTS engine. Designed specifically for high combustion pressure environments — such as high-boost, track, and built engine applications — this kit significantly strengthens the cylinder head clamping force and improves sealing integrity over the factory head bolts.
Head studs are a critical yet often overlooked upgrade when increasing boost pressure or running forged internals. Pairing these studs with a high-performance head gasket — such as the HKS Super Cooling Pro gasket — dramatically reduces the risk of head gasket leaks or head lift under extreme combustion loads.
Strong ARP Custom Age 625+ Material: Uses premium high-tensile fasteners crafted from ARP’s Custom Age 625 Plus material for excellent strength, fatigue life, and corrosion resistance.
Bottomed Type Stud Design: Studs thread deeper into the block, increasing active thread engagement and dispersing stress over a longer length for higher load endurance.
Improved Head Seal Security: Enhances head gasket clamping force — especially important when paired with high-compression or modified gasket setups like the HKS Grommet Super Cooling Pro.
Engineered for Forced Induction: Ideal for turbocharged builds with elevated boost levels and higher combustion pressures than stock.
Designed for G16E-GTS: Precision-engineered for the specific thread sizes and geometry of the GR Corolla’s three-cylinder turbo engine.
For engines pushing beyond factory power levels — especially in high-boost turbo or closed-deck builds — standard OEM head bolts can be a limiting factor in sustaining cylinder head sealing integrity. Under high combustion pressure and heat cycles, conventional bolts can stretch or experience stress concentration, reducing clamping force and risking:
• Head gasket failure
• Uneven sealing pressure
• Head lift
• Loss of compression
Upgraded head studs prevent these issues by maintaining consistent, high clamping load across combustion cycles, lowering the risk of leakage and increasing engine reliability under extreme operating conditions.
This head studs kit is ideal for:
High-boost turbo builds
Track and drag applications
Closed deck engine configurations
High-compression short block builds
GR Corolla engines that have elevated combustion pressures
When combined with a performance head gasket, these studs create a foundation capable of handling serious tuning potential.
• Includes high-strength head stud bolts designed to replace factory head bolts (M12 x4 & M11 x4 configuration).
• Designed for professional installation — proper torque sequence and plating lubricant recommended.
• Pair with a performance gasket and head bolts (if applicable) for best long-term results.
• Strongly recommended on all high-output engine builds to protect against head gasket failure.
Will this spec improve reliability on stock engines?
Yes — even on lightly tuned engines, upgraded studs provide a more consistent clamping force and better resistance to heat and pressure cycles.
Do I need this with the HKS Super Cooling Pro gasket?
Yes — because stronger studs help ensure the enhanced gasket maintains uniform sealing under higher combustion pressures.
Are these head studs reusable?
High-strength studs are typically reusable when installed and removed properly under correct torque procedures.
Will this improve horsepower?
Not directly — but it supports higher boost and safer tuning by improving sealing reliability.
Part #22999-AT001
