Do the Pistons and Rods for G16E-GTS include a crankshaft or add displacement?

No. The HKS Pistons and Rods for G16E-GTS keep the factory 87.5mm bore and 89.7mm stroke, so displacement stays at 1,618cc. HKS sells its 1.75L capacity upgrade kits, with an 88.0mm bore and a 95.7mm stroke crankshaft, as separate products.

Can the pistons or rods be installed on their own?

Yes, but HKS does not recommend it. HKS states that the piston kit or the connecting rod set can be installed alone, but either combination causes vibration from imbalance. This kit supplies the BCD pistons, the STEP3 rods and the matching pins together.

What compression ratio does the kit produce?

With the factory cylinder head and the stock 0.69mm head gasket, HKS lists a compression ratio of 10.7. An HKS 0.8mm gasket gives 10.6 and an HKS 1.0mm gasket gives 10.3, so the gasket choice lets the builder set the ratio for the planned fuel and boost.

Does the block need machining?

No boring is needed. HKS states that boring and honing are not required at the factory 87.5mm bore, although honing is allowed to reach a piston clearance of 0.029 to 0.054mm. Each cylinder needs a small chamfer at the bottom edge of the bore.

Is a tune required after installation?

Yes. The new pistons change the crown shape and compression ratio of the G16E-GTS, so the engine management must be tuned by a qualified tuner. The kit includes no ECU or tune, and HKS specifies a break-in of about 620 to 1,860 miles. The HKS Pro Head Stud Kit is sold separately.

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Description

HKS BCD HC-TT STEP3 Pistons and Rods for G16E-GTS Toyota GR Corolla

HKS’s BCD HC-TT STEP3 Pistons and Rods for G16E-GTS Toyota GR Corolla pair three billet BCD pistons with HKS I-beam connecting rods and matching pins for the three-cylinder engine in the GZEA14H GR Corolla, keeping the factory 87.5mm bore and 89.7mm stroke. The pistons are A2618 high-temperature alloy with a Triple Tumble crown for knock resistance, and HKS rates the machined nickel-chrome steel rods 25% stronger than stock. It suits an owner who wants stronger internals at the factory 1,618cc.

Development and Testing

HKS shaped the Triple Tumble crown so that, as the piston rises, a third tumble flow forms on the intake side and spreads the flame quickly near the edge of the chamber, where knock tends to start. That lets HKS run a slightly higher compression ratio than stock, and three oil jets carry cooling oil through the piston.

Features

Billet Bridge Concept Design pistons for rigidity with reduced weight
Nickel plating above the top ring groove, a two-layer anti-seizure coating and a titanium coated top ring
Shortened piston pin bosses and machined edges to remove heat spots
Machined nickel-chrome steel I-beam rods with WPC treatment for fatigue strength
Matching 24mm piston pins supplied with the set

Specifications

Bore: 87.5mm (factory size)
Stroke: 89.7mm (factory crankshaft)
Displacement: 1,618cc
Piston weight: 352g
Piston pin: 24mm diameter, 56mm long
Compression ratio: 10.7 on the factory 0.69mm gasket, 10.6 on the HKS 0.8mm gasket, 10.3 on the HKS 1.0mm gasket
Piston-to-wall clearance: 0.029 to 0.054mm

Applications

Toyota GR Corolla: GZEA14H | 2023-2025 | G16E-GTS

Notes

No crankshaft is included and displacement does not change
Professional installation by an experienced engine builder is required
Engine management tuning is required, and no ECU or tune is included
Boring and honing are not required, but HKS specifies a chamfer on the bottom edge of each cylinder
HKS states that the piston kit or rod set can be fitted alone, but either causes vibration from imbalance, which is why the Pistons and Rods for G16E-GTS are supplied together
HKS lists its 0.8mm and 1.0mm G16E head gaskets as 23002-AT003 and 23002-AT006
HKS developed the kit on a Japanese-market car and has not yet tested it in other markets
This part is intended for off-road or competition use where emissions laws apply, and the buyer is responsible for checking local regulations

Frequently Asked Questions

Do the Pistons and Rods for G16E-GTS include a crankshaft or add displacement? No. The HKS Pistons and Rods for G16E-GTS keep the factory 87.5mm bore and 89.7mm stroke, so displacement stays at 1,618cc. HKS sells its 1.75L capacity upgrade kits, with an 88.0mm bore and a 95.7mm stroke crankshaft, as separate products.
Can the pistons or rods be installed on their own? Yes, but HKS does not recommend it. HKS states that the piston kit or the connecting rod set can be installed alone, but either combination causes vibration from imbalance. This kit supplies the BCD pistons, the STEP3 rods and the matching pins together.
What compression ratio does the kit produce? With the factory cylinder head and the stock 0.69mm head gasket, HKS lists a compression ratio of 10.7. An HKS 0.8mm gasket gives 10.6 and an HKS 1.0mm gasket gives 10.3, so the gasket choice lets the builder set the ratio for the planned fuel and boost.
Does the block need machining? No boring is needed. HKS states that boring and honing are not required at the factory 87.5mm bore, although honing is allowed to reach a piston clearance of 0.029 to 0.054mm. Each cylinder needs a small chamfer at the bottom edge of the bore.
Is a tune required after installation? Yes. The new pistons change the crown shape and compression ratio of the G16E-GTS, so the engine management must be tuned by a qualified tuner. The kit includes no ECU or tune, and HKS specifies a break-in of about 620 to 1,860 miles. The HKS Pro Head Stud Kit is sold separately.

About HKS

HKS is a Japanese performance engineering brand founded in 1973 and headquartered in Fujinomiya, Shizuoka, with a long-standing reputation for developing high-quality aftermarket parts and motorsport-proven technology for enthusiast and professional applications. Known for innovations in turbocharging and engine performance, HKS produces a broad range of components including exhaust systems, turbo kits, electronics / engine management, and suspension solutions, with product development heavily influenced by decades of involvement in racing disciplines such as circuit time attack, drag, and drifting.

Additional Information

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Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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HKS BCD HC-TT STEP3 Pistons and Rods for G16E-GTS Toyota GR Corolla [21004-AT011]

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HKS BCD HC-TT STEP3 Pistons and Rods for G16E-GTS Toyota GR Corolla

Development and Testing

Features

Specifications

Applications

Notes

Frequently Asked Questions

About HKS

Reviews