Atomic Performance 698 GTA Engine Package – Full Specifications

Built for high-performance applications, this Atomic engine package is meticulously engineered for durability, power, and reliability.

Engine Block & Bottom End

• Ultrasonic tested seasoned Ford block – only thick-walled blocks are used (4 in 10 rejected).
• Deburred oil drainback holes, coolant passages, and block webbing for optimal oil flow.
• Fully machined block: torque plate honed cylinders, decked to crank centerline, and main saddle alignment checked.
• Crankshaft: Magnaflux inspected, indexed, reground, micro-polished journals, and chamfered oil holes.
• Conrods: Atomic billet Superleggera 6.060″ C/C, bushed for floating pins, ARP 2000 bolts, precision ground tunnels, and direct oil-fed gudgeons.
• Pistons: Cosworth F1 Series dish-top with 4 valve reliefs and 8.7:1 compression ratio.
• Bearings: ACL Competition bearings with a 360° thrust bearing upgrade.
• Main Bearings: High-flow #6 and #7 for increased oil supply.
• Gaskets: Atomic Competition Gasket & Seal Kit with MLS-D diesel-style head gasket.

Cylinder Head & Valvetrain

• Atomic Stage 4 Cylinder Head: CNC-machined multi-angle valve job, hand-ported intake and exhaust bowls, injector boss streamlining, and fine Ra deck surface.
• Stainless oversized valves, race-spec spring tensions, new PC seals, and #306801 Ovate Race Spec springs with HD collet set.
• Atomic anti-pump-up lifters preloaded for high RPM use.
• Custom Atomic billet camshafts (profile of choice).

Timing & Oil System

• Heavy-Duty Timing Kit: Reinforced chain, Atomic billet “Parabolic” guide, HD tensioner, and CrMo pivot bolt.
• Billet Steel Crank Sprocket: Atomic #306562.
• Oil Pump: Atomic STEEL Billet gear oil pump with EDM cut chrome moly gears, billet end plate, hi-flow circuitry, and upgraded relief spring.

Reinforced Structure & Balancing

• Main Cap Girdle & Windage Tray: 10mm Atomic hi-tensile alloy steel main cap girdle for crank stability.
• Balancer: Atomic Hi-Mass ANDRA/SFI approved harmonic balancer with CrMo stepped face washer, high-tensile bolt, and Nordlock washer.
• Precision balanced for high RPM operation.

Final Assembly & Extras

• Engine fully test-run in Atomic’s test cell for oil pressure, compression, and ring bed-in verification.
• Finish Options: High-temp engine enamel (color of choice), powder-coated rocker & timing cover (2 color choices).
• Documentation: Torque specs manual, run-in procedure sheet, and USB with test data.
• Included: Up to 14L of run-in 15W/40 oil, Ford oil filter, NGK spark plugs.
• Warranty: 12 months conditional warranty.

This engine is built for enthusiasts demanding extreme performance with proven reliability.

Please note: Lead time can be up to 4 weeks. Please ask before purchase.