AMS VR38 Alpha 4.3L Stage 1 Crate Engine

Description

Harness massive big-displacement twin-turbo torque with the AMS VR38 Alpha Crate Engine 4.3L Stage 1 package. Engineered for Nissan GT-R racing builds, this huge 4.3-liter stroker V6 engine produces 1,200 brake horsepower at 7,400 RPM. Custom billet stroker cranks and reinforced ductile iron sleeves form an unyielding foundation that generates instant low-RPM throttle response and extreme boost stamina.

Technicians machine the cast aluminum closed-deck block to accept large-bore ductile iron cylinder sleeves. A 4340 billet steel long-stroke crankshaft spins within cross-bolted billet steel main caps. Forged 4340 H-beam connecting rods anchor 96.0 millimeter 2618 forged pistons through a 99.0 millimeter stroke. A 9.8:1 compression ratio optimizes volumetric efficiency. Sump oil volume requires 6.8 quarts inside a modified wet pan. Bare long block weight totals 455 lbs.

Key Features of AMS VR38 4.3L

Discerning builders buy AMS VR38 4.3L Stage 1 crate engine packages to eliminate turbo lag on large compressor wheels. The long block drops flush into R35 chassis bays using original subframe hardware.

• 99.0 millimeter stroker crankshaft expands displacement to 4.3 liters for immediate spool.
• Stepped ductile iron sleeves eliminate bore distortion under severe boost loads.
• 2618 forged pistons endure intense combustion heat without ring land fracture.
• Billet steel main caps lock main bearing journals against high-torque flex.
• ARP Custom Age 625 head studs clamp heads against extreme cylinder pressures.
• CNC pocket-ported cylinder heads flow substantial air volume into combustion bowls.
• High-rate valve springs prevent float up to 7,800 RPM competition limits.
• Balanced VR38 4.3L rotating parts isolate destructive crankshaft vibration frequencies.

Dynamic Cam Profile Dyno Output

Operating across a wide 2,800 to 7,500 RPM power band, this big-displacement long block produces 1,200 brake horsepower and 1,050 lb-ft torque on E85 or 100-octane race fuel. Custom camshaft profiles feature 264 degrees duration with 10.6-millimeter valve lift. Manifold vacuum reads 15 in-Hg at an 850 RPM base idle. Hot engine oil pressure holds steady between 55 to 75 PSI during full-throttle acceleration pulls, supplying continuous lubrication to main bearings and twin turbocharger center housings under intense heat.

Chassis Crossmember Bellhousing Fitment Clearances

Engineers designed this unit to mate straight to factory Nissan GT-R all-wheel drive transaxle driveshafts. Internal neutral balance protects flywheel flanges from harmful rotational vibration. Factory engine mount points drop flush onto stock front subframes. Billet oil pan contours preserve clearance around front differential tubes and steering racks without chassis alterations.

Break-In Protocol Competition Operating Limits

Pre-lube all internal oil passages using high-zinc mineral break-in oil through a pressure canister before starter engagement. Bleed trapped air from cooling circuits through top radiator bleeder screws. This engine package is not engineered for raw sea water cooling, boost past 35 PSI on pump gasoline, or unmonitored nitrous oxide injection.

• Evacuate initial break-in motor oil after the first 50 dyno miles.
• Renew competition synthetic motor oil every 1,500 track miles.
• Inspect spark plug gaps and valve lash every 12 months.

Warranty Coverage Pallet Crate Manifest

A 12-Month competition limited warranty protects against material and manufacturing defects. The reinforced wooden pallet crate houses the complete long block, billet oil pan, timing covers, harmonic damper, spark plugs, dyno test certification sheet, and detailed setup manual. Components ship vacuum-wrapped to prevent oxidation during transit.