Built for High Boost. Built for Big Power. Built to Last.

The HKS 1.75L Closed Deck Short Block transforms the GR Corolla’s G16E-GTS engine into a reinforced, high-displacement foundation designed for serious power applications.

This is not a stock rebuild.
This is a precision-machined, forged, closed-deck engine block engineered to handle high cylinder pressure, high boost, and high sustained load.

If you're planning a high-output turbo build, this is where it starts.

What Makes This Short Block Different?

Increased Displacement – 1,746cc

Compared to the stock 1,618cc G16E engine, the HKS short block increases displacement to 1.75L using:

• 88.0mm bore (vs 87.5mm stock)
• 95.7mm stroke (vs 89.7mm stock)

More displacement means:

• Stronger mid-range torque
• Better turbo spool characteristics
• Increased airflow potential
• More headroom for high boost tuning

Closed Deck Conversion – Why It Matters

The factory GR Corolla block is open deck.

HKS processes this block into a closed deck configuration to:

• Reduce cylinder wall distortion
• Improve sealing under high boost
• Increase structural rigidity
• Improve head gasket stability

Closed deck construction is critical for serious boost levels where combustion pressures increase dramatically.

To maintain cooling efficiency, HKS optimizes the water jackets and adds cooling improvements around Cylinder #2 — an area known to be stress-sensitive in high-output builds.

Triple Tumble High-Compression Forged Pistons

This short block incorporates HKS’s “Triple Tumble” piston design.

Benefits:

• Promotes controlled tumble flow inside combustion chamber
• Reduces knock tendency
• Allows higher compression and higher boost
• Improves combustion efficiency

The pistons also utilize HKS’s BCD (Bridge Construction Design), providing:

• Increased rigidity
• Reduced weight
• Better durability under detonation stress

STEP3 Forged I-Beam Connecting Rods

• High-strength machined I-beam design
• 25% stronger than factory rods
• Increased torque capacity
• Designed for high cylinder pressure builds

This is a major durability upgrade over stock components.

Forged Crankshaft & Bearings

• Machined chrome steel crankshaft
• Reduced inertia counterweight positioning
• Lightweight but high-rigidity construction
• ACL main and rod bearings
• Main oil gallery thoroughly cleaned post-machining

This ensures reliability at high RPM and under sustained load.

Important Fitment Note

Stock balance shafts cannot be used with this setup.

This is intended for performance builds where balance shaft deletion is acceptable.

Technical Specifications

Engine: G16E-GTS
Displacement: 1,746cc
Bore: 88.0mm
Stroke: 95.7mm
Configuration: Closed Deck
Product Code: 23011-AT009

Recommended Supporting Components

For proper build integration, HKS recommends:

• HKS Grommet HGK Super Cooling Pro Head Gasket (89mm bore)
• HKS Head Studs Kit Pro
• High-performance engine oil (HKS Racing Pro 10W50 recommended)

This is not a plug-and-play install. It is a professional engine build component.

Who Is This For?

This short block is ideal for:

• High-boost turbo builds
• Track-focused GR Corolla builds
• Big turbo setups
• 500+ horsepower goals
• Builders who want long-term durability
• Customers exceeding stock block reliability limits

If you are planning serious power on the GR Corolla platform, reinforcing the short block is the smartest investment you can make.

Frequently Asked Questions

Is this a complete engine?
No. This is a short block assembly. Cylinder head, valvetrain, and external components are not included.

Can this handle high boost?
Yes. The closed deck conversion and forged internals are specifically engineered for high combustion pressure applications.

Will this increase horsepower on its own?
No. Power increases depend on turbo, fuel system, tuning, and supporting modifications.

Is this street-friendly?
It can be, but it is intended for performance builds and high-output applications.

Is professional installation required?
Yes. This product should only be installed by experienced engine builders.