AMS Performance VR38 Stage 4 Long Block for R35 Nissan GT-R


AMS Performance VR38 Stage 4 Long Block

Available on backorder

SKU: ALP.07.04.0504-1 Categories: , Brand:

AMS Performance VR38 Stage 4 Long Block for R35 Nissan GT-R

For over two decades, AMS Performance has led innovation in the automotive aftermarket sector, particularly with forced induction technologies. Their performance systems are acclaimed for setting new benchmarks in quality and innovation.

Introducing the AMS Performance 4.1L VR38 Stage 4 Long Block, designed for peak horsepower enhancements in Nissan GTRs. This long block, pre-assembled for easy installation, is precision-engineered using the latest technology at AMS. It has been robustly modified to endure the significant power and torque from the OMEGA and ALPHA upgrade packages. Constructed in a modern clean room that rigorously controls temperature and humidity, every component is fine-tuned to perfection. Utilizing years of success in competitive racing, AMS has formulated the most formidable and sophisticated engine program for the Nissan VR38.

The Pinnacle of VR38 Engines

  • Leveraging a legacy of competitive racing success, AMS has set a new standard for the VR38DETT V6 engine, establishing a top-tier engine program. Through the development of unique AMS proprietary components, this program represents the zenith of engine performance for the GTR, evidenced by outstanding track performance. The 4.1L VR38 Stage 4 Long Block from AMS Performance is engineered for unparalleled power and reliability. Designed as a full assembly for seamless integration, it’s equipped to enhance your GTR with minimal hassle. This engine leverages superior AMS spec components, reflecting the highest commitment to quality.

Race Winning Experience Creates Higher Standards

  • The engineering of AMS engines mirrors the precision and dedication found in their championship-winning race cars. Choosing an AMS engine connects you with a profound legacy of over twenty years in racing engine innovation. Like their 3000+ WHP race cars, each engine is meticulously balanced, blueprinted, and constructed to adhere to strict performance criteria. Every block undergoes extensive inspection to assure a robust foundation for the engine. AMS also maintains detailed spec sheets for each engine, cataloging tolerances, torque specifications, and clearances, demonstrating their dedication to unparalleled quality.


  • The perfect solution for high horsepower builds
  • Best suited for the ALPHA 18X turbo kits (up to 68mm inducers)
  • Fully assembled long block ready for manifolds and accessories
  • Precision machining with advanced industry leading equipment
  • Assembled in state-of-the-art temperature and humidity controlled clean room
  • Utilizes your existing engine as a core to build from
  • New OEM gaskets, seals, and hardware throughout
  • ARP CA625+ head studs for additional clamping force and head gasket sealing

Technical Specifications

  • Displacement: 4.1L
  • Bore: 95.5mm (grade 1,2, or 3 varies)
  • Stroke: 94.4mm
  • Appx. Compression Ratio: 9.75 : 1
  • Recommended Rev Limit: 8600rpm
  • Recommended Max Power & Torque: 1700whp / 1200lb-ft

Build Sheet

  • AMS Stage 4 Short Block
    • Inspect and blueprint engine block
    • Hone / recondition cylinder to size
    • Main girdle reinforcement and 12mm ARP Studs
    • Hone main journals to AMS spec
    • Bryant Racing Billet “Stroker” Crankshaft
    • Manley 300M Connecting Rods to AMS spec
    • Manley Pistons to AMS spec
    • BBC Rod Bearings conversion
    • Bryant Crankshaft full balance job
    • King Main Bearings
    • BBC Modified Rod Bearings
    • New OEM seals and gaskets
    • New OEM timing chains
    • AMS proprietary timing system upgrade
    • AMS OEM oil pump rebuild and pressure modification
    • Multiple stage cleaning and prep process
    • ARP CA 625+ Head Studs
    • Cometic Head Gaskets
    • AMS Billet Deep Oil Pan
    • ATI Crank Balancer
    • Sterling Charcoal powder coated timing covers
    • AMS Stage 4 Head Package
  • AMS Stage 4 Head Package
    • T1 Race Development Stage 1 CNC Head Porting Package
    • Cylinder head recondition, clean, reassemble
    • Ferrea high performance valve job
    • Deck / resurface
    • Shim and set valve lash
    • Ferrea +1 Valves, Dual Valve Springs, Titanium Retainers, Lock, Seals, Seats, Bronze Valve Guides
    • Tomei 282 Camshafts
    • Combustion chamber / head gasket reinforcement modifications with included hardware
    • Proprietary cylinder head and cam shaft modifications


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

Other Stages


  • Horsepower, torque figures, and RPM limits are estimations and can differ widely due to various influences like turbocharger choice, intake and exhaust constraints / backpressure, as well as fuel octane and quality, among other factors. The numbers provided here are derived under ideal conditions with the right supporting modifications and represent achievable outcomes for the typical customer. However, individual results may differ.
  • It is assumed that a long block in good condition is provided for the build. To prevent confusion and the risk of missing parts, it is requested that all long blocks be shipped fully assembled, from valve covers to oil pan, including timing covers and crank pulley. Any components found to be in non-reusable condition will be identified and replacements will be quoted during the engine assembly process.
  • Fits all USDM, JDM, Gulf, and European (LHD & RHD) CBA, DBA, EBA & 4BA models

CARB and / or EPA Compliance Testing Not Completed

  • They believe that this product is either applicable for a CARB EO exemption or complies with the EPA’s Anti-Tampering Policy, yet the necessary testing and administrative processes have not been completed at this time. Consequently, this product is not available for purchase for emissions-controlled vehicles situated within California, nor can it be shipped to addresses in California, without a completed AMS Race Waiver form. Users outside of the United States are advised to comply with their local laws and regulations.

About AMS Performance

AMS Performance stands out in the realm of turbocharged vehicle enhancement, not just as a frontrunner in the manufacturing of automotive performance parts but also by providing comprehensive services including in-house engine computer calibration, installations of parts and packages, along with engine and transmission building. Distinctively an engineering-driven entity, AMS differentiates itself from other outfits by designing parts that set the performance standard in the industry, utilizing advanced computer-aided designs and the expertise of mechanical engineers with extensive motorsports background. Since its inception 20 years ago, AMS Performance has maintained its leading position, offering everything from turn-key solutions to bespoke components tailored to surpass a variety of performance objectives. Catering to a wide range of motorsport activities from drag racing to road racing, AMS is dedicated to elevating the driving experience for enthusiasts across the spectrum.

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.
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