HKS Step 3 Stroker Kit – Nissan RB26DETT | 2.8L Stroker | Complete Internal Engine Build Kit

The HKS Step 3 Stroker Kit for the Nissan RB26DETT is HKS's most comprehensive internal engine build kit for the RB26 — a complete 2.8L stroker kit that takes the RB26DETT's displacement from the factory 2,568cc to 2,800cc through an increased stroke crankshaft, matched forged pistons, and all required internal components for a complete high-power RB26 engine build. At $26,600 CAD, the HKS Step 3 kit represents the pinnacle of HKS's RB26 internal engine program — a kit engineered for serious high-power RB26 builds where the factory displacement, compression, and internal component strength are insufficient for the power targets being pursued. HKS is Japan's most respected performance engine and turbocharger brand — with decades of RB26 development experience spanning their own GT-R competition programs and the broader RB26 performance community. This kit requires professional engine building by an experienced RB26 specialist. It is not a bolt-on upgrade.

Key Features:

• 2.8L stroker displacement — increased stroke crankshaft takes the RB26DETT from 2,568cc to 2,800cc — more displacement means more torque across the RPM range and a broader, more usable power band for the high-power RB26 build
• HKS Step 3 specification — HKS's most comprehensive RB26 internal kit — engineered for the highest power targets in HKS's RB26 build program — correct for builds targeting serious power output where Step 1 and Step 2 kits are insufficient
• Forged internal components — forged crankshaft, forged connecting rods, and forged pistons engineered for the thermal and mechanical loads of a high-power, high-boost RB26 build
• Complete kit — all required internal components for a complete RB26 stroker engine build — eliminates the need to source individual components from multiple suppliers and ensures correct component matching and clearances
• HKS engineering — developed by HKS with decades of RB26 competition and performance development experience — the same engineering that has powered HKS's own GT-R competition programs
• Correct component matching — all components in the HKS Step 3 kit are engineered and matched to work together — correct piston-to-bore clearances, correct rod-to-crank geometry, and correct compression ratio for the intended application

HKS RB26 Step System — Understanding the Tiers:

HKS structures their RB26 internal engine kits in a step system — each step representing a higher level of internal component specification and a higher power target ceiling:

• Step 1: Entry-level HKS RB26 internal kit — correct for moderate power upgrades where the factory block and basic internal components are being retained with upgraded pistons and rings. Suitable for builds in the lower-to-mid power range of the RB26's performance envelope.
• Step 2: Mid-level HKS RB26 internal kit — upgraded forged components for higher power targets. Correct for builds targeting higher boost and power output where Step 1 components are insufficient.
• Step 3 (this kit — HKS21004-AN021): HKS's most comprehensive RB26 internal kit — the 2.8L stroker specification with the highest-specification forged components in HKS's RB26 program. Correct for the most serious high-power RB26 builds where maximum displacement, maximum component strength, and maximum power ceiling are required. The correct choice for builds targeting the upper limits of what the RB26 platform can achieve.
• Summary: The Step 3 kit is the correct choice when the power target exceeds what Step 1 or Step 2 components can support, or when the 2.8L stroker displacement increase is specifically desired for its torque and power band benefits.

2.8L Stroker — Why Increase Displacement?

• More Torque: Increased displacement produces more torque across the RPM range — a 2.8L RB26 produces more torque at any given boost level than a 2.6L RB26 running the same boost. More torque means stronger acceleration, better throttle response, and a more usable power band — particularly at lower RPM where the factory 2.6L's torque output is more limited.
• Broader Power Band: The additional displacement broadens the RB26's power band — the engine produces meaningful power and torque over a wider RPM range, making the car easier to drive quickly on both road and track.
• Higher Power Ceiling: More displacement allows more power to be extracted at any given boost level — a 2.8L RB26 can produce more power than a 2.6L at the same boost pressure, or produce the same power at lower boost for improved reliability.
• RB26 Platform Potential: The RB26DETT is one of the most capable inline-six engine platforms ever produced — a twin-turbocharged, DOHC, 24-valve engine with a strong block, excellent head flow, and a proven ability to support extreme power outputs with the correct internal components. The HKS Step 3 2.8L stroker kit unlocks the RB26's full potential — combining increased displacement with HKS's highest-specification forged internals for a complete, purpose-built high-power RB26 engine.

Specifications:

• Brand: HKS
• Part Number: HKS21004-AN021
• Barcode: 21004-AN021
• Kit: Step 3 Stroker Kit
• Displacement: 2.8L (2,800cc) — stroked from factory 2,568cc
• Application: Nissan RB26DETT — BNR32 / BCNR33 / BNR34 Nissan Skyline GT-R
• Weight: 65 lbs (shipping weight)
• Refer to HKS's product documentation for complete component list, specifications, and recommended clearances

Fitment Information:

• Nissan RB26DETT — BNR32 Skyline GT-R (R32) / BCNR33 Skyline GT-R (R33) / BNR34 Skyline GT-R (R34)
• Verify compatibility with your specific RB26DETT block specification before ordering — confirm that HKS21004-AN021 is the correct Step 3 kit for your specific RB26 build configuration with your engine builder before purchasing
• Critical: Professional engine building by an experienced RB26 specialist is required. This kit is not a bolt-on upgrade. Incorrect installation will result in engine failure. Engage your engine builder before ordering to confirm kit specification, required machine work, and build plan.

What's Included:

• HKS Step 3 stroker crankshaft — increased stroke for 2.8L displacement
• HKS forged connecting rods
• HKS forged pistons — matched to the 2.8L stroker specification
• All required internal components for a complete RB26 stroker build
• Refer to HKS's product documentation for the complete component list and specifications — confirm all required components are included for your specific build before ordering

Build Requirements — What Else You Will Need:

The HKS Step 3 Stroker Kit provides the core internal components for the RB26 stroker build — but a complete high-power RB26 engine build requires additional components and machine work beyond the kit itself. Your engine builder will advise on the specific requirements for your build, but typical additional requirements for a complete Step 3 RB26 build include:

• Machine work: Block boring and honing to the correct piston clearance, line boring if required, deck surfacing, and head reconditioning
• Head components: Upgraded valve springs, retainers, and potentially camshafts depending on the power target
• Gaskets and seals: Complete engine gasket set, head gasket (upgraded for high-boost applications), and all required seals
• Bearings: Main bearings, rod bearings, and thrust bearings to the correct clearance specification
• Oiling system: Upgraded oil pump, oil cooler, and oil system components appropriate for the power target
• Fuel system: Upgraded injectors, fuel pump, and fuel pressure regulator appropriate for the power target
• Engine management: A professional tune on a capable standalone ECU is required after a Step 3 build — the factory ECU is not appropriate for a high-power 2.8L RB26 build
• Turbocharger system: Upgraded turbochargers appropriate for the power target — the factory RB26 turbos are not appropriate for the power levels a Step 3 build is capable of

Installation Notes:

• Professional engine building by an experienced RB26 specialist is required — this is not a DIY project
• Engage your engine builder before ordering — confirm the complete build specification, required machine work, additional components required, and total build cost before purchasing the kit
• Confirm correct piston-to-bore clearance, rod bearing clearance, and main bearing clearance with your engine builder — these clearances are critical for engine reliability at high power output
• A professional tune on a capable standalone ECU (Link, Haltech, Motec, ECUMaster, or equivalent) is required after the build — do not attempt to run a high-power 2.8L RB26 on the factory ECU or an uncalibrated map
• Break-in procedure is critical after a fresh engine build — follow your engine builder's recommended break-in procedure before subjecting the engine to full boost and high RPM

Why HKS?

HKS is Japan's most respected performance engine and turbocharger brand — founded in 1973 and with over 50 years of performance engine development experience spanning their own motorsport programs, OEM development partnerships, and the broader Japanese performance aftermarket. HKS's RB26 program is one of the most comprehensive in the industry — developed through their own GT-R competition programs and refined through decades of real-world high-power RB26 builds. The HKS Step 3 Stroker Kit represents the culmination of that development — the highest-specification RB26 internal kit from the brand that knows the RB26 better than anyone. For serious RB26 builders who want the best available internal kit from the most trusted name in Japanese performance engine development, HKS Step 3 is the definitive choice.

Perfect For:

• Serious high-power RB26DETT builds — R32, R33, and R34 Skyline GT-R — where the power target requires the 2.8L stroker displacement increase and HKS's highest-specification forged internal components
• Competition and time attack RB26 builds where maximum displacement, maximum component strength, and maximum power ceiling are required
• Builders who want HKS's complete, matched internal kit for their RB26 stroker build — eliminating the complexity and risk of sourcing individual components from multiple suppliers
• The most serious RB26 builds where only the best available internal components from the most trusted RB26 development brand are acceptable

Critical Notes: Professional engine building by an experienced RB26 specialist is required — this is not a bolt-on upgrade. Engage your engine builder before ordering to confirm kit specification and build plan. A professional tune on a capable standalone ECU is required after the build. Confirm all additional required components with your engine builder before ordering. Refer to HKS's product documentation for complete specifications and required clearances.