Mazworx Stage 2.5 Short Block (SR20 RWD)

The Mazworx Stage 2.5 Short Block for the Nissan SR20 engine is engineered for Rear Wheel Drive (RWD) chassis including S13, S14, and S15, supporting power levels up to 800 horsepower. This high-performance short block upgrade offers a reliable foundation for serious engine builds while maintaining strong OEM quality and durability.

Key Components Included

• CP Forged Pistons measuring 90mm with a 9.0:1 compression ratio
• Upgraded wrist pins with a .250″ wall thickness for increased strength
• Darton dry sleeves to improve cylinder durability and heat management
• BC ProH625+ connecting rods designed for high-stress applications
• ACL race bearings: 5-hole main bearings and 19mm rod bearings for enhanced reliability
• New OEM oil pump to ensure proper lubrication
• Mazworx main studs and front oil squirter for additional internal security and cooling
• Various plugs required for proper assembly

Professional Assembly and Machining

• Complete hot tank cleaning and sandblasting of the block
• Removal, retapping, and replacement of oil port plugs to ensure leak-free operation
• Machined for threaded freeze plugs and 1/2″ head studs for improved sealing and durability
• Installation of dry sleeves and precision cylinder resizing
• Use of a torque plate during honing for accurate cylinder bore geometry
• Step decking to ensure proper block height and alignment
• Resizing of line bore and specialized oil groove machining tailored to the SR20 design
• Complete crankshaft preparation: cleaning, inspection, polishing, and balancing
• Precision machining of the 19mm rod bearing journals
• Final assembly of the short block to high standards

Customer Responsibilities

Customers are required to provide the following components in good condition:

• Core block including mains, girdle, and oil squirters
• Core crankshaft

Options Available

• Setup for VE head conversion, which includes VE pistons, VE oil pump, and block oil drain modifications

The Mazworx Stage 2.5 short block is ideal for tuners and performance enthusiasts looking to build a robust SR20 engine with proven componentry and expert machining. The combination of forged internals, race-spec bearings, and thorough assembly make it suitable for high-power RWD applications.