AMS VR38 Alpha Pro Series Short Block Short Block Crate Engine

Description

Need bulletproof VR38 bottom-end strength? Select the AMS VR38 Alpha Short Block Pro Series package. Engineered for Nissan GT-R R35 drag and track builds, this 3.8-liter short block handles 1,200 brake horsepower at 7,800 RPM. Stepped ductile iron sleeves, custom forged connecting rods, and cross-bolted billet steel main caps eliminate factory engine block distortion under severe turbo boost.

Engine machinists press ductile iron sleeves into the factory cast aluminum block before precision deck leveling. A nitrided 4340 billet steel crankshaft spins within six-bolt billet steel main caps. Forged 4340 H-beam connecting rods connect to 95.5 millimeter 2618 forged pistons through an 88.4 millimeter stroke. A 9.2:1 compression ratio matches severe boost demands. Wet sump capacity requires 6.0 quarts. Dry short block weight registers at 218 lbs.

Key Features of AMS VR38 Pro

Engine builders buy AMS VR38 Pro crate engine short blocks to establish extreme bottom-end durability under heavy forced induction. Each short block drops flush into stock GT-R chassis cradles using OEM mounting hardware.

• Stepped ductile iron sleeves eliminate cylinder bore splitting under extreme boost pressures.
• 2618 forged aluminum pistons resist severe thermal detonation shock without cracking.
• Upgraded steel wrist pins prevent pin distortion during violent transbrake launches.
• Forged 4340 connecting rods resist deflection under massive low-RPM torque spikes.
• ARP main studs secure six-bolt main caps to prevent crankshaft cap walk.
• Performance coated rod bearings reduce friction during extreme RPM track sprints.
• Dynamic balanced rotating group parts dampen secondary harmonics across high RPMs.
• Precision VR38 Pro tolerances preserve bearing clearance stability under racing stress.

Dynamic Torque Dyno Output Curves

Operating across an aggressive 3,400 to 7,800 RPM power band, this competition short block platform supports 1,200 brake horsepower and 950 lb-ft torque on E85 flex fuel or race gas. When matched to Alpha camshafts and CNC ported heads, it achieves exceptional volumetric airflow. Intake manifold vacuum holds 15 in-Hg at an 850 RPM base idle. Hot engine oil pressure runs between 55 to 75 PSI during continuous track pulls, delivering adequate lubrication to journals under brutal cornering forces.

Chassis Mating Bellhousing Drop Clearances

This short block mates to the Nissan GT-R dual-clutch transmission drive shaft system and rear-mounted transaxle bellhousing. Internal neutral balance protects flywheel flanges from excessive vibration. Motor mount locations align flush with factory R35 subframe mounts. Front differential driveshaft tunnels and steering rack linkages maintain stock operating clearance without modifications.

Break-In Protocol Short Block Limits

Pressurize internal oil galleries with high-zinc mineral break-in oil before mounting cylinder heads and initial start-up. Bleed cooling jackets through radiator bleeder screws to expel air bubbles. This short block package is not engineered for raw sea water cooling, boost past 38 PSI without race fuel, or unmetered nitrous shots.

• Drain the initial break-in motor oil after the first 50 dyno miles.
• Replace competition synthetic motor oil every 1,500 track miles.
• Inspect cylinder bore walls and bearing clearances every 12 months.

Warranty Coverage Pallet Crate Manifest

A 12-Month competition limited warranty protects against material and manufacturing defects. The banded wooden crate holds the machined short block, custom main studs, crank balancer key, balance test sheet, and complete engine blueprint build documents. Components arrive wrapped in vapor-corrosion inhibiting plastic against moisture.