AMS Performance VR38 Alpha 4.1L Alpha Short Block Engine

Description

Stabilizing cylinder bore geometry requires the AMS Performance VR38 Alpha 4.1L Alpha Short Block Engine and its thick-wall ductile iron sleeves. Achieve minimal blow-by during sustained wide-open throttle track sessions. This build utilizes a heavily fortified OEM casting to support demanding racing applications safely.

Engine Architecture & Core Specifications

• Block Material: OEM cast aluminum VR38DETT, precision CNC line bored and fitted with thick-wall ductile iron sleeves.
• Cylinder Heads: Built short block only.
• Compression Ratio: Optimized custom compression ratio tailored for high-boost E85 applications.
• Bore & Stroke: 95.5 mm bore x 95.5 mm stroke (4.1L Stroker).
• Rotating Assembly: Heavy-duty forged aluminum pistons, extreme-duty H-beam connecting rods, and a billet stroker crankshaft.

Component Breakdown: Built Short Block

Engineering an indestructible bottom end requires replacing standard aluminum walls with highly reinforced iron sleeves.

• Custom aftermarket cylinder sleeves prevent cylinder wall cracking under massive boost pressures associated with large turbo upgrades while high tensile fasteners lock down the main caps.
• Thick forged connecting rods and heavy duty forged pistons prevent catastrophic bending while managing intense cylinder temperatures generated during prolonged track sessions.

Vehicle Fitment & Compatibility Matrix

This sleeved setup integrates flawlessly into the factory chassis by utilizing original mounting points and hardware. Sourcing one of our custom built stroked short blocks provides a turn key foundation for your next high horsepower build.

• Fits 2009-2024 Nissan GT-R Premium editions aligning flawlessly with the factory transmission bellhousing.
• Fits 2012-2024 Nissan GT-R Black editions providing the perfect foundation for upgraded twin turbo setups.
• Fits 2014-2024 Nissan GT-R Track editions dropping directly onto the OEM motor mounts.
• Fits 2015-2024 Nissan GT-R NISMO editions eliminating the need for local machine shop wait times.
• Fits 2024 Nissan GT-R T-Spec editions integrating seamlessly with aftermarket tubular subframes.

Fuel & Ignition System Requirements

Achieving four-digit horsepower figures dictates utilizing heavy-duty fueling hardware and specialized tuning parameters.

• Complete fuel system upgrades including brushless pumps and massive injectors are necessitated to feed high horsepower targets safely.
• Running E85 is highly recommended for thermal management while utilizing colder spark plugs gapped tightly to ensure consistent ignition.

Installation, Break-In Oil & Priming Instructions

Professional mechanical preparation separates a successful engine build from a catastrophic premature failure.

• Bolt on the factory cylinder heads and turn the engine over with the fuel system disconnected until the oil pressure gauge registers mechanical pressure.
• Add high zinc engine break in oil to the crankcase to properly seat the new piston rings before performing a 500 mile conservative driving break in period.

USA Warranty, Emissions & Logistics

Completing this transaction requires careful coordination of core returns and heavy freight handling.

• The core exchange program requires sending in a crack free OEM VR38DETT block for inspection prior to shipment to activate assembly guarantees.
• This off road race block is not CARB compliant and delivers via LTL Freight to commercial addresses equipped to offload heavy wooden crates safely.