Atomic 998 GT-A | Drag Spec | 1500hp Capable Retrofit

Atomic 998 GT-A

The Atomic 998 is based on our reliable, proven  698 GT-A package that has been mayn customers to 1000hp. The 998 GT-A takes it another leap to push it to 1500hp with big boost. It is a rigorously engineered, high-performance long engine designed for extended high power use with reliability margin for racers who demand the ultimate in power and reliability. 

Key Features:

• Optimized and strengthened block:
  • Ultrasonic tested seasoned Ford block, chosen for maximum wall thickness and strength. We estimate 1 in 10 blocks is fit for a 998   
  • 698 deburring is completed before additional deburring and porting is done on oil drain back holes, webbing, and coolant passages for enhanced flow after grouting.   
• Precision Crankshaft:
  • Stage 3 heat treated and race prepared crankshaft: Crack tested > deburred > heat treated > straightened > polished/chamfered polished and chamfered 
  • Crank comes pre-dowelled with included billet flex plate. (Manual - send flywheel to Atomic) 
• High-Performance Pistons & Rods:
  • Cosworth F1 Series dish top or flat top pistons with 8.7:1 or 10.8 compression ratio and 4-valve reliefs.   
  • Atomic billet Superleggera connecting rods with CA625 bolts as standard, cylindrically ground/honed tunnels, and pressure-fed gudgeons for optimal strength and cooling. Coated side skirts and noise reducing crown to eliminate piston slap at low engine temp and RPM.   
• Enhanced Cylinder Head:
  • Fully prepped Atomic Stage 4 cylinder head with CNC machined valve job, hand porting, and streamlined injector boss tracts.
  • Choice of Atomic cams (Stage 3 or 4 suggested, 4+ and 5+ possible)    
  • Stainless oversize valves, Ovate Race Spec springs, and H/D collet set for superior valve control.   
• Robust Valve Train & Timing:
  • Atomic anti pump-up lifters and preload settings optimized for high RPM.    
  • Atomic billet camshafts (Atomic 4+ or 5+ recommended).   
  • Atomic heavy-duty timing chain kit with billet steel crank sprocket and parabolic billet guide.   
• Strengthened Bottom End:
  • Atomic hi-tensile 10mm billet steel main cap girdle and windage tray for increased block rigidity.    
  • ACL Competition bearings with 360-degree thrust bearings as standard   
  • Hi-flowed #6 and #7 main bearings.
  • Atomic/ATI Super-Damper ANDRA/SFI approved harmonic balancer and hub assembly.   
• Oil System Enhancements:
  • Atomic ALL-STEEL Billet gear oil pump with EDM cut gears, billet steel end plate, and upgraded relief spring.   
  • Race spec clearances throughout the engine to suit intended usage.   
• Precision Machining & Assembly:
  • Fully machined block: torque plate honed cylinders, decked to crank centerline, main saddle alignment checked.   
  • Fine Ra finish on deck surface and chambers relieved.   
  • Precision blueprinting and assembly of long motor.   
•  Tested Before Delivery:   
  • Engine is fully test-run in our engine test cell with comprehensive report supplied.   

Included:

• New brass Welch plugs.   
• Engine paint (choice of color).   
• Powder coated rocker cover and timing cover (choice of hundreds of colors).   
• Torque specs manual, run-in procedure sheet, spare gaskets, merch.    
• 14 liters of run-in 15W/40 oil, Ford oil filter, and NGK spark plugs.   
• 12-month conditional warranty.   

Optional Upgrades:

• Part grout-filling of coolant passages.   
• Fire ring head gasket kit.   
• CNC drilled block and head to suit 14.3mm size head studs.   
• Atomic M14.3mm Tool Steel Head stud kit with O/S washers.     
• Adjustable vernier gear cam sprockets.   
• VTC Delete spigots and Blank-off plates.   
• Atomic Roller rockers.   
• Titanium valve spring retainers.   
• Torrington crank thrust bearing upgrade.   
• High volume Big Ears sump upgrade.   
• Dowelling of crank to flexplate/flywheel.   
• -10 AN welded in rocker cover breathers.