Mazworx SR20VE Sleeved Block Stage 2.1 NA

The Mazworx SR20VE Sleeved Block Stage 2.1 NA package offers a comprehensive engine block preparation tailored for Nissan SR20 enthusiasts seeking reliable high-performance upgrades for naturally aspirated setups. Designed for DIY engine builders, this package enhances your engine block’s durability and precision to support higher bore sizes and performance targets.

Professional Block Preparation

Utilizing advanced CNC machining and state-of-the-art equipment, Mazworx ensures that every step of the block prep is executed with meticulous precision. This includes hot tank cleaning to thoroughly remove oil and grime, and sand blasting to eliminate corrosion and debris, restoring the block’s appearance to a uniform satin aluminum finish.

Darton Dry Sleeve Installation

Ideal for performance builds targeting around 400 horsepower, this package includes the removal of old sleeves and installation of high-strength Darton dry sleeves made from ductile iron, capable of supporting over 1000 horsepower. This process features precise machining and step decking to ensure the sleeves extend above the deck surface, enhancing head gasket sealing under high-stress conditions.

Precision Boring and Honing

Our CNC 3-axis boring machine centers the bores with exacting accuracy. The block can be bored between 90mm and 92mm depending on your specification. Following boring, we use a Sunnen SV-10 cylinder hone with diamond tooling to achieve an exceptional surface finish, critical for performance and longevity.

Additional Enhancements for Durability and Maintenance

• Surface Surfacing: Step decking machined on a 3-axis CNC machine to optimize clamping force and sealing.
• Oil Port Plug Removal and Replacement: All oil port plugs are removed for thorough cleaning of oil galleries, retapped, and fitted with Mazworx O-ring threaded plugs for a reliable seal and easy future maintenance.
• Freeze Plug Upgrade: Factory freeze plugs are replaced with billet threaded plugs for enhanced reliability.
• Torque Plate Honing: We use custom torque plates to simulate cylinder head bolting during honing, ensuring precise bore geometry during assembly.
• Main Studs, Caps, and Line Boring: Blocks are line bored within factory specifications using custom tooling. Includes cap grinding and line honing for accurate main journal sizing.
• Front Main Oil Squirter Upgrade: The OEM timed chain oil squirter is replaced with a threaded version to prevent blowout issues.

Core Block Requirement and Included Parts

You will need to send in your SR20 core block for this machining and preparation service. The package includes:

• Mazworx / ARP Main Studs
• Mazworx Front Oil Squirter
• Darton Sleeves
• Mazworx Threaded O-ring Plugs
• NPT Plugs
• New Oil Pump
• Mazworx Freeze Plugs
• Mazworx Breather Adapter

The Mazworx SR20VE Sleeved Block Stage 2.1 NA is an ideal starting point for naturally aspirated SR20 builds aiming for a precise, durable foundation with enhanced bore capability and advanced block preparation techniques.