Retail Price: $18,000.00US
AMS Performance have successfully applied their race-winning experience to the GT-R’s VR38 to bring you the paramount in engine programs. By developing AMS proprietary engine components they have engineered the strongest, most advanced VR38′s available for your GT-R. This 4.0 liter Big-Bore Race Short Block adds displacement while maintaining a great peak RPM capability by increasing bore and not stroke. The result is an increase in power without compromising RPM limitations. With proper tuning and supporting modifications the AMS Alpha 4.0 Race Short Block is capable to rev up to over 8,000 RPM!
In addition, AMS raised the compression ratio to further increase horsepower throughout the powerband. This increase also produces more low end torque which further reduces turbo lag and improves boost response. By combining a larger bore size with an increased compression ratio, they have achieved a 5-10% increase in torque and a 300-400 rpm improvement in turbo spool up time. This race-proven power plant uses only the best off the shelf and custom designed AMS spec. components. Combine that with the latest in machine and assembly practices and you are assured only the best!
Each block is precisely machined to accept Darton ductile iron sleeves. Once installed the block is then final bored, honed and align honed to ensure perfect clearances and fitment. The finished product allows for higher cylinder pressures and added strength and rigidity to the block. AMS worked closely with JE Pistons and Manley Rods to specially design engine components worthy of the Alpha program. The AMS Extreme-Duty Pistons feature improved oiling characteristics, Teflon coated skirts for reduced friction and extra thick ring lands for added strength. The AMS Extreme-Duty Connecting Rods utilize large 7/16″ ARP 2000 bolts (22% larger than stock) for added durability and peace of mind.
To further improve the VR38 platform, each block deck is machined to receive a copper o-ring to establish a better combustion seal. Every Alpha 4.0 block is then precisely balanced, blueprinted and hand assembled to AMS exacting standards. Before assembly each block is checked for correct dimensions, cylinder bore, mains, and block flatness to guarantee you get the best foundation for your new engine.
- Great peak RPM capability by increasing bore and not stroke
- Increased compression ratio for added horsepower and torque
- 5-10% increase in torque
- 300-400 rpm improvement in turbo spool up
- AMS proprietary components for the strongest, most advanced engine program available
- O-ringed block deck for a better combustion seal
- Balanced rotating assembly
- Precise, documented hand assembly
- Custom compression ratios available
NOTE: Price includes Core Charge. If you can supply your own engine and do NOT need to return a core, please select below.