Atomic GT-R Unlimited Long Motor – Ford Barra DOHC | Ultimate Spec | Billet Crank | 2000hp+ Capable | No-Compromise Race Engine

Description:
The Atomic GT-R Unlimited is the absolute pinnacle of Barra engine development — designed with zero limitations, engineered for 2000+ horsepower, and built for the most extreme drag, no-prep, and competition environments. Every component in this engine is the best we offer. No shortcuts. No compromises.

Built around an Atomic Billet Crank you can spec this monster as either 4.0L or 3.5L. Featuring a part or fully grouted and CNC-machined block, Cosworth F1-spec custom pistons, FatRod billet conrods, custom tool steel head and main studs, and our highest-spec CNC race head, the GT-R Unlimited is race-proven and dyno-validated in multiple 7-second full-weight cars — and beyond.

If you're planning to break records, win events, or set a new benchmark for Barra performance, this is your engine.

? Key Features

? Block & Bottom-End Engineering

• Ultrasonically tested 998-series Ford block
  • Partially or fully grouted for maximum rigidity under extreme boost

• CNC-machined and blueprint prepped
  • Torque plate honed and decked to a fine Ra finish for MLS-D/bronze ring sealing

• Billet main caps and 16mm billet steel main girdle

• Dowelling for flexplate/flywheel and crank

? Crankshaft & Rotating Assembly

• Atomic Billet Crank - Standard or short stroke
  • Fully counterweighted, aerodynamic, nitrided, EN040, polished, balanced

• Custom Cosworth F1 forged pistons
  • Nearly 100g lighter than other common pistons but strong enough for the biggest of builds.

• Atomic FatRod billet H-beam conrods
  • Rated to 2000hp+, with included CA625 bolts. More with optional 0.927" pin upgrade
  • Pressure-fed gudgeon pins and piston crown cooling

? Cylinder Head – Race CNC Unlimited Spec

• Atomic Ultimate CNC Race Head – top-tier porting and combustion shaping
  • Flow-optimised injector tracts, deep bowl CNC, optimised seat angles

• Stainless oversize intake & exhaust valves

• Ovate wire drag-spec valve springs, titanium retainers, hardened collets, low profile valve stem seals

• Includes Atomic billet camshafts – Stage 4+ or 5+ or custom profile

? Valvetrain & Timing

• Atomic anti-pump-up lifters for low maintenance or solid lifters for max RPM

• Adjustable vernier cam sprockets

• Heavy-duty timing chain kit with billet crank gear and billet curved/parabolic guides

• Pre-clearanced and matched to cam lift and spring pressure

? Oil & Vibration Management

• Atomic billet all-steel oil pump
  • EDM-cut gears, nitrided CRMO backing plate, uprated bypass

• ATI/Atomic SFI-rated Super Damper - A must for 1000hp+ motors

• High-volume Big Ears baffled sump

• Windage tray and oil control enhancements standard

? Final Assembly & Testing

• Fully blueprint-assembled and race-clearanced in-house
  • Mains, rods, piston-to-wall, and lash tailored to race spec

• Test-run in engine cell with custom reporting
  • Includes documentation of final compression, oil pressure, and valve train motion

?? What’s Included

• Fully assembled GT-R Unlimited Long Motor

• Powder-coated rocker and timing covers (custom colour options available)

• Run-in oil (14L), Ford oil filter, NGK spark plugs

• Atomic torque spec sheet, run-in guide, printed test cell report

• Atomic merchandise and spare gaskets

• 12-month conditional warranty