Atomic Barra Built Cylinder Heads | CORE EXCHANGE
Engineering Overview
SPEC-DOC
Atomic Built Cylinder Heads
Heads are supplied serviced and we install Valves/springs/retainers only
Contact atomic for additional parts and services for your head
WHAT YOU NEED TO KNOW
All Atomic Cylinder Heads are sold on an Exchange Basis. You must provide a serviceable core. We supply heads serviced with limited parts. Your head will be prepped and set up with valves, stem seals, retainers, collets and springs only. For lifters, rockers, cams and additional setup/shimming please contact us.
Need a core? We may be able to provide one at an additional cost based on current stock. Please contact us to discuss.
Shipping: We can help organize shipping of your core to our workshop.
Additional services: Seat replacement/upgrade, guide replacement, hand porting, CNC porting, chamber shaping and modification, stress relief deburr, cam tunnel honing, 14mm head stud modification
Unlock The Power In Your Head
The Barra cylinder head flows well from the factory, but there is massive room for improvement in velocity and efficiency. Whether you need a simple refresh for a street car or a dedicated race head to support 1500hp+, our staged program offers a solution for every build.
Velocity is King. Our Stage 4 Hand Porting increases both flow AND velocity by 10-12%. This isn't just about peak numbers; the increased velocity dramatically improves low-end torque, turbo spool, and throttle response. Our chamber modifications and polishing also help with combustion efficiency and stability.
The Atomic Standard
Every head we build starts with a rigorous inspection process. Castings are pressure tested, checked for cracks, and cam tunnels are honed. We deck every head to a specific surface finish optimized for MLS-D gaskets, ensuring a perfect seal under boost. Ported heads are done so to improve overall response and driveability in additional to flow gains and care is taken to maintain port wall thickness in critical areas. Heads are then serviced and partially assembled ready for your additional parts. We can fit additional Atomic valve train components and complete the shimming and preload process as an additional service.
Choose Your Stage
Stage 2 (OEM Rebuild)
The Refresh. Perfect for stock or mild street cars.
- Turbo O-Series Exhaust Valves
- Atomic #306800 Springs & HD Retainers
- New Stem Seals & HD Collets
- Decked, Honed & Pressure Tested
Stage 3 (OEM+)
The Street Performer. Recommended for 700-800hp.
- Includes Stage 2 Spec
- Plus: +0.5mm Stainless Exhaust Valves
- Plus: Increased Spring Pressure
- Ideal for maxing out stock turbos or medium upgrades.
Stage 4 (Do-It-All)
The Powerhouse. Our most popular head for builds under 1500hp.
- Includes Stage 3 Spec
- Plus: Hand Porting (+10-12% Velocity)
- Plus: Oil Drain Deburring
- Rec Cams: Stage 3, 4, or 4+
Stage 5 (Pro Race)
The Drag Spec. Maximum flow for maximum effort.
- CNC Porting Program
- Plus: +2.0mm Stainless Valves
- Plus: Titanium Retainers & Custom Seats
- Rec Cams: Stage 4+, 5+ or Custom
🏆 Stage 6: The Ultimate
Stage 6 is identical to the Stage 5 Race spec but is built on a BRAND NEW OEM FORD CASTING. Includes new seats and guides. The ultimate no-compromise foundation.
Tech Specs
Application: Ford Barra DOHC 4.0L (BA-FGX)
Valves: Stainless Steel (Oversize on Stage 3+)
Porting: Hand Finished (Stg 4 - 66.2cc chamber) / CNC (Stg 5/6)
Springs: Atomic Matched Sets
