• Mazworx bare engine-block angled view. Customer-core service example; pictured hardware varies.
  • Mazworx cylinder honing setup. Customer-core service example; pictured hardware varies.
  • Mazworx threaded plug detail. Customer-core service example; pictured hardware varies.
  • Mazworx sleeved block deck view. Customer-core service example; pictured hardware varies.
  • Mazworx cylinder sleeve and deck detail. Customer-core service example; pictured hardware varies.
  • Mazworx main-journal machining. Customer-core service example; pictured hardware varies.
  • Mazworx SR20 block underside and main-cap assembly. Customer-core service example; pictured hardware varies.
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MazWorx Authorized Dealer

Mazworx SR20 Sleeved Block Stg 4V Service  Billet Front Cover (for dry sump)

Mazworx SR20 Sleeved Block Stg 4V Service

$4,920.94
$4,920.94
Sale Sold out
Oil pump

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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 S13 SR20DET core block. Confirm compatibility and condition before ordering.

The Sending In VE oil-pump option requires a customer-provided SR20VE oil pump.

Service work and components

  • Hot Tank Cleaning
  • Sand Blasting
  • Utilizing a 3-axis CNC machine ensures bores are perfectly centered
  • The Sunnen SV-10 cylinder hone with diamond tooling delivers an exceptional cylinder finish
  • Bores can be sized from 86mm up to 90mm, tailored to your needs
  • Step Decking
  • Oil Port & Freeze Plug Upgrades
  • Honing with a custom torque plate simulates cylinder head mounting, maintaining cylinder roundness and accuracy after assembly — a crucial step when using sleeved blocks
  • Line boring aligns main journals precisely, followed by sizing to factory specifications
  • Main studs are upgraded to robust 1/2″ grade studs to handle increased power
  • Oil Groove Machining
  • Front Main Oil Squirter Upgrade
  • Mazworx/ARP Main Studs
  • Mazworx Billet Main Caps with 1/2″ Studs
  • Mazworx Billet Main Girdle
  • Mazworx Front Oil Squirter
  • Mazworx Threaded O-ring Plugs and Freeze Plugs
  • Darton Dry Sleeves
  • NPT Plugs
  • Mazworx Water Pipe Plug
  • Mazworx Billet Breather Adapter

Selected options define the supplied work and component upgrades. Unselected extras are not included.

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