Mazworx SR20 Sleeved Block Stg 4V

The Mazworx SR20 Sleeved Block Stage 4V is expertly prepared for high-performance Nissan SR20 engines, designed to support horsepower outputs exceeding 1000hp. Crafted with precision through advanced CNC machining and state-of-the-art processes, this block upgrade is ideal for serious enthusiasts and DIY builders seeking a reliable and robust foundation for street or strip applications.

Comprehensive Block Preparation

• Hot Tank Cleaning: Thorough cleaning removes oil, grime, and contaminants to prepare the block for machining.
• Sand Blasting: Restores the block’s surface by eliminating corrosion and debris, resulting in a uniform satin aluminum finish.

Durable Cylinder Sleeves

The block receives Darton Dry Sleeves made from high-strength ductile iron, capable of handling power levels over 1000hp. This process includes the removal of old sleeves, CNC machining for new sleeve installation, and precision step decking to enhance sealing and strength.

Precision Bore and Honing

• 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.

Surface Machining & Sealing Enhancements

• Step Decking: The block deck is machined so the sleeves extend above the surface, concentrating clamping force for improved head gasket sealing under high boost.
• Oil Port & Freeze Plug Upgrades: Oil port plugs are removed, thoroughly cleaned, and retapped with threaded o-ring plugs for superior sealing. OEM freeze plugs are replaced with CNC-machined threaded plugs, ensuring durability and ease of maintenance.

Torque Plate Honing & Main Bearing 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.

Additional Performance Features

• Oil Groove Machining: Available for various block types to accommodate 5-hole main bearings, enhancing oil supply to main and rod bearings.
• Front Main Oil Squirter Upgrade: A secure threaded squirter replaces the OEM version to reliably lubricate the timing chain.
• RWD Oil Drain Plug: RWD blocks can be modified to accept VE oil pumps by plugging the additional oil drain hole.

Core Requirements & Included Parts

This service requires you to send in your core S13 SR20DET block. The Stage 4V package includes:

• 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
• New OEM VE Oil Pump
• Mazworx Water Pipe Plug
• Mazworx Billet Breather Adapter