Mazworx SR20DET RWD Long Block Stage 2

The Mazworx SR20DET RWD Long Block Stage 2 represents a comprehensive, high-performance upgrade beyond the Stage 1.5 build for Nissan SR20DET engines. Designed to support power outputs up to 600 horsepower, this long block is meticulously rebuilt with a combination of refurbished and premium upgraded components to ensure reliability and enhanced performance.

Stage 2 Short Block

The short block undergoes an extensive labor process, including complete disassembly, thorough cleaning, and precision machining to optimize durability and fitment:

• Complete disassembly and hot tank cleaning of block components
• Sand blasting the block for surface prep
• Removal, retapping, and replacement of oil port plugs
• Machining for installation of threaded freeze plugs
• Installation of Darton sleeves and precise cylinder resizing with torque plate honing
• Step decking and line bore resizing to exact specifications
• Oil groove machining tailored for the SR20
• Crankshaft cleaning, inspection, polishing, and balancing
• Final assembly of the short block

High-quality parts integrated into the short block include:

• CP 90mm pistons with 9:1 compression ratio and upgraded .200″ wall wrist pins
• BC Pro625+ connecting rods
• ACL race bearings
• SR20DET S14 oil pump
• Darton sleeves for enhanced cylinder durability
• Mazworx SR20 main stud kit
• Mazworx threaded and O-ringed freeze plug kit
• Mazworx front oil squirter specific to SR20
• Mazworx billet breather adapter
• Mazworx -10AN water pipe or plug alongside miscellaneous plugs

Stage 2 Cylinder Head

The cylinder head is carefully rebuilt and upgraded with precision machining and premium components to improve airflow and durability:

• Disassembly and hot tank cleaning
• Removal, drilling, tapping, and replacement of oil port plugs specific to SR architecture
• Machining for threaded freeze plugs
• CNC porting and combustion chamber work for optimized flow
• Valve guide removal, reinstallation, and reaming
• Multi-angle valve job
• Grinding of rockers for dual guide compatibility and precise rocker level setting
• Resurfacing and full head assembly

Parts fitted in the cylinder head include:

• Supertech +1mm intake valves
• Supertech Iconel +1mm exhaust valves with 6mm stems
• Supertech titanium valve retainers
• Supertech dual spring kit rated at 90lbs
• Supertech bronze valve guides and valve stem seals
• Kelford camshaft set (HLA 188-B) with 268° intake and 272° exhaust duration
• Mazworx threaded and O-ringed freeze plug kit
• Miscellaneous plugs and freeze plugs

Long Block Assembly

Final assembly and quality checks include:

• Complete long block assembly
• Spin and prime process with break-in oil
• Verification of oil flow and pressure

Additional components installed:

• Mazworx/Apexi full grommet head gasket (91mm x 1.2mm)
• ATI SR20 RWD street damper
• Timing chain kit with Mazworx timing chain tensioner
• Mazworx SR20 engine bolt kit
• Kelford adjustable cam gears (S14/S15 models include one Kelford and one OEM VTC gear)
• GReddy high capacity oil pan
• Valve cover powder coating and service including Mazworx valve cover washer kit
• Miscellaneous seals and gaskets

Core Requirement: A core SR20DET RWD long block is required for this build. Core parts will be evaluated upon disassembly. New rocker arms are not included in the price.