AMS Performance 4.1L VR38 Stage 4 Long Block

The cornerstone of the highest horsepower VR38 engines on the planet.


Build Times Vary for AMS Engines Assemblies. Contact Sales Dept. for Latest ETA.


SKU ALP.07.04.0504-1 Category Tags , Brand:

California Residents: Prop 65 Warning

Additional information

Weight 450 lbs
Dimensions 38 × 42 × 37 in

CARB And / Or EPA Compliance Testing Not Completed

While we believe this product is either CARB EO exemption applicable, or complies with the EPA's Anti-Tampering Policy, we have not completed the required testing and administrative process at this time. This product is not available to purchase for emissions-controlled vehicles located within the state of California, or available to ship to California addresses, without a completed AMS Race Waiver form. International users outside of the United States should act in accordance with their local laws and regulations.

FREE SHIPPING on all orders over $199.99 in the lower 48. (Exclusions Apply)

With 22 years of documented research and development in the forced induction field, AMS Performance has proven itself as the powerhouse in the automotive aftermarket. Our award winning performance systems are what all others are measured by.

The AMS Performance 4.1L VR38 Stage 4 Long Block is the ultimate solution for high horsepower builds in your Nissan GTR. This fully assembled long block is ready for effortless installation and is crafted with precision machining using our advanced in-house equipment. Each AMS built engine has been strategically strengthened in multiple ways to support the monstrous power and torque produced by our OMEGA and ALPHA performance packages. Assembled in a state-of-the-art temperature and humidity controlled clean room, it ensures every detail is meticulously crafted to perfection. By applying our decades of race-winning experience to the Nissan VR38 we have engineered the strongest, most advanced engine program available for your GTR.

  • The Perfect Solution for High Horsepower Builds
  • Best Suited for the ALPHA 18x Turbo Kit (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



The Pinnacle of VR38 Engines

We have successfully applied our race-winning experience to the VR38DETT V6 to bring you the pinnacle in engine programs. By developing AMS proprietary engine components we have engineered the strongest, most advanced motor program available for your GTR, along with the track times to back it up. The AMS Performance 4.1L VR38 Stage 4 Long Block is the ultimate solution for high horse power reliability. Our long block engine assemblies come complete from valve covers to oil pan to timing chain and components to make installation as painless as possible, ready to drop right in to your GTR! This proven power plant uses only the best off the shelf and custom designed AMS spec components made to our exacting standards.

Technical Specifications

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

Build Sheet

AMS Stage 3 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

  • 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 w/included Hardware
  • Proprietary Cylinder Head and Cam Shaft Modifications


Our Race Winning Experience Creates Higher Standards

All of our built engines are individually handcrafted at AMS using the same care as the ones found in our world record setting race cars. When you choose an AMS engine you are investing in the knowledge gained from assembling thousands of race engines over the past 20+ years. Just like in our 3000+ WHP race cars, every motor is balanced, blueprinted and assembled to our precise specifications. Before assembly each block is checked for correct dimensions, cylinder bore, main alignment, block flatness, and more to ensure you get the best foundation for your new engine. Every engine we assemble has an archived spec sheet where tolerances, torque specs, and clearances are documented as part of our standard quality control process.



  • * Horsepower and torque numbers, and RPM limits are approximate and can vary significantly depending on numerous factors such as your turbocharger selection, intake and exhaust restriction/backpressure, and fuel octane and quality, among many others. The advertised numbers herein are based on optimal conditions and utilizing proper supporting modifications, but are generally attainable results by an average customer. Your results may vary.
  • In rare cases, our component selection may vary from advertised based on supply chain delays. All component substitutions will be communicated in advance by your AMS Sales Representative during the engine assembly process.
  • Assumes that a good condition core long block is sent in to build from. To avoid confusion and the possibility of missing parts we ask that all long blocks are shipped to us fully assembled from valve covers to oil pan, including timing covers and crank pulley. Components that are not in reusable condition will have replacements quoted during the engine assembly process.


  • 2009-2011 (CBA) Nissan R35 GT-R
  • 2012-2016 (DBA) Nissan R35 GT-R
  • 2017-2019 (Facelift DBA / “EBA”) Nissan R35 GT-R
  • 2020-Current (4BA) Nissan R35 GT-R
  • Fits all USDM, JDM, Gulf, and European Models (LHD & RHD)

Related Products

Search by product name, SKU or keyword