Engineered to Fix the G16E’s Cylinder #2 Heat Imbalance

The HKS Super Cooling Pro Head Gasket for the G16E-GTS is not just a stronger gasket — it is a revised cooling solution designed to reduce knock variation between cylinders, specifically addressing the GR Corolla’s known tendency for elevated heat in cylinder #2.

Under high load and boost, the factory gasket design can allow uneven cooling flow, leading to:

• Increased knock in cylinder #2
• Ignition timing retard
• Uneven combustion stability
• Reduced tuning headroom

HKS redesigned the coolant flow path to improve temperature balance across all three cylinders — increasing knock resistance and improving consistency under boost.

This is especially critical for high-power and closed deck builds.

Available Thickness Options

0.8mm (Part #23002-AT007)

• Approx. 10.6:1 compression (reference value)
• For higher compression setups
• Ideal for responsive turbo builds

1.0mm (Part #23002-AT008)

• Approx. 10.4:1 compression (reference value)
• Slightly lower compression option
• Better suited for higher boost levels

Bore Diameter: 89mm
Engine: G16E-GTS

Always confirm compression calculations with your builder.

What Makes This Different from a Standard MLS Gasket?

Revised Cooling Water Flow Design

HKS modified the cooling passages to:

• Enlarge coolant flow to the front of the head
• Add cooling channel near direct injector area
• Add cooling passage between cylinders
• Reduce temperature imbalance between cylinders

In controlled testing:

With the stock gasket:
Cylinder #2 experienced the highest knock levels even with timing pulled 1°.

With the HKS Super Cooling Pro:
Knock levels were nearly equal across all cylinders, with no timing retard required.

That means:

• More consistent combustion
• Greater knock resistance
• Improved tuning stability
• Increased reliability under high boost

Grommet Type Reinforced Structure

This is a reinforced stopper-type metal gasket designed for turbocharged performance applications.

Benefits include:

• Increased sealing strength
• Improved head lift resistance
• Designed for high combustion pressure
• Suitable for high boost and forged builds

This is not a basic replacement gasket — it is a performance tuning component.

Important Installation Notes

This gasket requires machining modifications to the head and block to match the revised cooling passages.

Specifically:

• Machine grooves in the cylinder head as needed
• Drill vertical coolant passages to match gasket design
• Professional installation strongly recommended

This is intended for engine builds — not casual bolt-on installs.

Recommended Pairings

For best results, combine with:

• HKS 1.75L Closed Deck Short Block
• HKS Head Studs Kit Pro
• HKS Racing Pro 10W50 Engine Oil
• Proper ECU calibration

This gasket is especially valuable in high boost or track-focused GR Corolla builds.

Who Is This For?

• Big turbo GR Corolla builds
• Closed deck engine builds
• Track cars running sustained high load
• High boost street builds
• Builders wanting maximum knock resistance

If you are pushing the limits of the G16E platform, coolant balance becomes critical. This gasket addresses it at the source.

Frequently Asked Questions

Is this required for stock engines?
No. This is primarily intended for built or high-output engines.

Does this increase horsepower?
Indirectly — by improving knock resistance and cylinder balance, it allows safer ignition timing and more stable tuning.

Do I need machining?
Yes. This gasket requires machining to match the additional cooling passages.

Which thickness should I choose?
0.8mm for higher compression builds.
1.0mm for slightly reduced compression and higher boost applications.
Consult your engine builder.

Will this work with the HKS 1.75L short block?
Yes. It is designed to complement that build configuration.