HKS Step Pro VR38DETT 4.3L Complete Engine for R35 Nissan GT-R



HKS Step Pro VR38DETT 4.3L Complete Engine

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HKS Step Pro VR38DETT 4.3L Complete Engine for R35 Nissan GT-R

The “HKS COMPLETE ENGINE POWERED BY HKS” is a potent testament to the widespread adoption of high-tech advancements, showcasing the finely tuned skills acquired over forty years. Its mastery is rooted in HKS’s participation in a variety of motorsport competitions, including Gr. A, Drag race, D1 GP, and TSUKUBA Time Attack. The firm’s goal is to engineer top-performance racing engines that offer increased power and remarkable durability. These engines, manufactured in the same facilities where earlier racing engines were developed, embody a wealth of knowledge and technological innovations borne from past racing exploits. The company is committed to preserving the distinct characteristics of both a pure racing car and a modified streetcar.

With a long history of superior racing engine design, the “HKS COMPLETE ENGINE POWERED BY HKS” relies on extensive expertise to maintain its leading edge. To ensure reliability, HKS opts for brand new cylinder blocks, recognizing the potential for undiscovered minor flaws in salvaged blocks. This careful choice symbolizes HKS’s dedication to crafting engines with precision. They meticulously follow deburring and chamfering procedures, which in turn deburr associated components, streamlining the integration of the head or additional equipment and thus boosting work efficiency. A detailed three-stage cleaning method removes all residual metal debris, enhancing accuracy and warding off possible engine issues.

Before initiating the cleaning process, engine blind caps are taken out. The engine sequentially receives an initial cleaning, steam-cleaning, and polishing for a final makeover. The boring process is conducted with extreme precision, considering possible distortions from the dummy head and metal. This precaution is achieved using specific head bolt and gasket parts. This painstaking attention throughout each phase ensures the production of supremely accurate engines. Honing and cross-hatching techniques draw on insights from past race engine designs. Alterations are made to the clearances in every part based on the expected engine output. Extreme care is applied in choosing pistons and conrods from the cylinder with perfect alignment, utilizing high-precision tools for torque fastening and high-performance angle management. In such an ideal setting, HKS’s strong resolve to uphold quality standards never wavers.


  • Designed for high torque
  • Focused for street driving
  • Nitride steel crankshaft, heat treatment for improved durability
  • Enlarged crankpin sidewall radius to improve torsional strength
  • Developed at HKS original oversize main stud bolts
  • #2 and #3 journal made of chrome molybdenum for improved durability
  • Line boring to ensure journal roundness
  • Beryllium-free copper valve seat and phosphor bronze guides to improve heat transfer
  • Crank damper for VR4.3 to decrease torsional vibration
  • Maximum torque of 1500 N・m


  • Bore
    • Stock: 95.5mm
    • HKS: 95.5mm
  • Stroke
    • Stock: 88.4mm
    • HKS: 99.0mm
  • Compression (t=0.8)
    • Stock: 8.6
    • HKS: 9.0
  • Max RPM
    • Stock: 7000
    • HKS: 7400
  • Displacement
    • Stock: 3799cc
    • HKS: 4255cc

Step Pro Complete Engine Specifications

  • Engine Head Modifications: beryllium-free copper seats + phosphor bronze guides, step removal + polishing around the sheet, combustion chamber polishing finish
  • Camshaft: HKS IN – 270° / lift 11mm + HKS EX – 278° / lift 11mm
  • Valve Spring: HKS strengthened
  • Valve: adjusted to seat
  • Head Gasket: HKS metal gasket (t=0.8)
  • Head Bolt: ARP strengthened stud bolt
  • Engine Block Modifications: #2 + #3 chrome molybdenum cap, main bearing oversized bolt, enlarged ladder cap hole / sitting, line boring to ensure journal roundness, honing
  • Main Bolt: HKS M12 stud bolt (625+)
  • Piston: HKS billet (molybdenum coating)
  • Conrod: HKS H-beam
  • Crankshaft: HKS billet with increased fillet radius
  • Main Bearing: ACL
  • Conrod Bearing: stock + WPC (width adjusted)
  • Crank Pulley: original VR43 damper
  • Covers: high temp paint
  • Spark Plug: HKS #10


  • 2009+ Nissan GT-R: R35 | 3.8L TT V6 VR38DETT
  • 2015+ Nissan GT-R Nismo: R35 | 3.8L TT V6 VR38DETT


  • Maximum torque is a value calculated based on HKS’ in-house test data, they do not ensure that the product can be used without failure
  • Please note that the figure of torque is fluctuated depends on the condition such as vehicle spec, track condition, driving situation or the distance of driving
  • Intake manifold, turbine and other engine auxiliary parts are not included

About HKS

HKS Co., Ltd. is a highly renowned Japanese automotive tuning and performance company. Founded in 1973 by Hiroyuki Hasegawa and Goichi Kitagawa, the company’s initials HKS are also derived from the name of its third partner, Sigma Automotive. With a reputation built on high-quality performance parts, HKS specializes in aftermarket components for a wide array of vehicles. The company has played a significant role in popularizing automotive tuning culture around the world. HKS is known for producing various performance-enhancing parts including turbochargers, exhaust systems, suspension components, and engine parts. Their products are engineered to provide maximum performance gains without sacrificing reliability or drivability.

Over the decades, HKS has expanded its reach by participating in various motorsport events, ranging from drag racing to drift competitions and circuit racing. Their expertise in tuning and enhancing vehicles has led them to significant successes in different motorsport arenas. The commitment to research, development, and innovation has cemented HKS’s place as a leader in the automotive aftermarket industry. By maintaining rigorous quality control and focusing on the precise engineering of performance products, HKS has established strong relationships with automobile manufacturers, dealers, and enthusiasts worldwide. Sustainability and environmental considerations are also part of HKS’s commitment. They continue to innovate in ways that enhance performance while considering environmental impact. With a rich history and an unrelenting passion for pushing automotive performance to its limits, HKS continues to be a sought-after brand for automotive enthusiasts seeking top-tier performance upgrades and tuning solutions.

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.
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.
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 with any inquiries.


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