Description

Atomic Built Cylinder Heads

Stage 2–6 | Exchange Program

?? Exchange Basis Only

All Atomic Cylinder Heads are sold on an Exchange Basis. You must provide a serviceable core.

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.

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.

?? DID YOU KNOW?

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. Next Gen Motorsports swapped to our Stage 4 head on a 1400+hp build and described the car as an "animal" that drove completely differently off-boost.

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.


Stage 4 - Velocity focused porting. Race Ready.

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) / CNC (Stg 5/6)
Springs: Atomic Matched Sets

Specifications

Compatibility

Atomic Built Cylinder Heads

Stage 2–6 | Exchange Program

?? Exchange Basis Only

All Atomic Cylinder Heads are sold on an Exchange Basis. You must provide a serviceable core.

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.

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.

?? DID YOU KNOW?

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. Next Gen Motorsports swapped to our Stage 4 head on a 1400+hp build and described the car as an "animal" that drove completely differently off-boost.

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.


Stage 4 - Velocity focused porting. Race Ready.

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) / CNC (Stg 5/6)
Springs: Atomic Matched Sets

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