• Mazworx cylinder head camshaft-side view. Customer-core service example; pictured hardware varies.
  • Mazworx cylinder-head end-face view. Customer-core service example; pictured hardware varies.
  • Mazworx combustion chambers and valve faces. Customer-core service example; pictured hardware varies.
  • Mazworx cylinder-head port close-up. Customer-core service example; pictured hardware varies.
  • Mazworx cylinder-head port and valve-guide detail. Customer-core service example; pictured hardware varies.
  • Mazworx cylinder-head port-side exterior. Customer-core service example; pictured hardware varies.
  • Mazworx valve-train component close-up. Customer-core service example; pictured hardware varies.
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MazWorx Authorized Dealer

Mazworx RB25DET NEO Head Stage 3 Service

Mazworx RB25DET NEO Head Stage 3 Service

$6,092.82
$6,092.82
Sale Sold out
Configuration

Out of stock

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This item is currently unavailable. Ask us about availability or help finding a suitable replacement.

Ask about availability or fitment

Year, make, model and engine help us check fitment.

We'll reply to your inquiry by email. This is not an automatic restock alert.

Shipping & returns

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Shipping details

In-stock orders are processed within 48 hours; transit time is additional.

International orders include export processing and customs clearance. Duties, taxes and brokerage are extra; final freight charges may change after remeasurement.

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Returns

Need help with a return? Request authorization within 30 days of delivery for eligible unused, uninstalled items. See details for exclusions and applicable fees.

Read the full return policy
Return details & how to start

Request return authorization (RMA) within 30 days of delivery for eligible items. Keep items unused and uninstalled, with original packaging and accessories. Electronics, liquids, special orders and other categories are excluded.

Email sales@frsport.com with RETURN and your order number in the subject to request an RMA. Please wait for return authorization before sending your item back.

Wrong part/size or change of mind: a 20% return processing fee applies, plus applicable shipping costs.

Original shipping is non-refundable. For orders shipped free, the actual outbound shipping cost is deducted from the refund. Return shipping is prepaid by the customer.

After payment capture, cancellations and refunds generally incur a 5% processing fee, except for our error, confirmed defects or confirmed carrier loss. The 5% and 20% fees do not stack; only the greater applicable fee applies. Store credit waives the 5% fee, but applicable return fees remain.

Missing, incorrect or transit-damaged items: report within 3 business days of receipt with photos of the product and packaging.

For defective items, contact us for help with the manufacturer's warranty process. The manufacturer decides the claim.

Specifications

Product details shared across all variants.

Category
Car Repair & Maintenance

This service uses customer-provided engine components. A replacement core is not included.

Provide RB25DET NEO core cylinder head. Confirm compatibility and condition before ordering.

Service work and components

  • Complete disassembly and sandblasting for a clean base
  • Removal, drilling, tapping, and replacement of oil port plugs
  • Stage 3 CNC port and combustion chamber porting
  • CNC machining for cam clearance enhancements
  • Modification for threaded freeze plugs
  • RB26-specific head stud machining
  • Valve guide removal, reinstallation, and reaming for precise fitment
  • Professional race-grade valve job
  • Cam lash setting and head resurfacing
  • Final assembly of the cylinder head
  • Kelford V-B camshafts with 268/280 duration and 11mm lift
  • Kelford retainers paired with 110lbs BeeHive valve springs
  • Kelford/Ferrea intake and exhaust valves, each oversized by +1mm
  • Supertech cam followers
  • Supertech bronze valve guides and valve seals
  • Ferrea valve locks for secure valve retention
  • Mazworx threaded freeze plugs and additional miscellaneous plugs

Confirm delivery arrangements before sending parts. Work starts only after the individual intake is approved.

Additional work and replacement parts need approval. Core credit requests require individual approval. No automatic core credit is included.

Photos show manufacturer work examples. The service uses customer-provided cores. Selected options and listed components define the supplied work.

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Vehicle fitment