Mazworx SR20DET RWD Long Block Stage 1.5
Price range: $11,899.00 through $14,699.00
Upgrade your Nissan SR20DET with the Mazworx Stage 1.5 RWD Long Block. Featuring upgraded pistons, rods, camshafts, and precision machining, this rebuild supports up to 500hp. Delivered fully assembled, spin-tested, and primed for reliable performance on S13, S14, or S15 chassis.
Modern Production Capabilities.
Advanced Engineering & Race Tested.
Modern Production Capabilities.
Advanced Engineering & Race Tested.
The Mazworx SR20DET RWD Long Block Stage 1.5 represents a comprehensive upgrade beyond the Stage 0.8 full performance build, delivering a fully refurbished and enhanced Nissan SR20DET engine ready to produce up to 500 horsepower. Each engine is meticulously rebuilt using high-quality upgraded components and undergoes a thorough spin and prime process with break-in oil prior to delivery, ensuring optimal performance and reliability.
Stage 1.5 Short Block
Labor
- Complete disassembly of the short block
- Hot tank cleaning and sand blasting of the block
- Removal, retapping, and replacement of oil port plugs
- Machining for threaded freeze plugs and sleeve installation
- Precise resizing of cylinders using torque plates during honing
- Step decking and line bore resizing for improved block integrity
- Oil groove machining specific to SR20
- Crankshaft cleaning, inspection, polishing, and balancing
- Reassembly of the short block with upgraded components
Included Parts
- CP pistons, 86mm with 9:1 compression ratio
- Manley H-beam connecting rods
- ACL race bearings
- Oil pump for SR20DET S14
- Darton cylinder sleeves
- Mazworx SR20 main stud kit
- Mazworx threaded and O-ringed freeze plug kit
- Mazworx front oil squirter for SR20
- Mazworx -10AN water pipe or plug
- Mazworx billet breather adapter and miscellaneous plugs
Stage 1.5 Cylinder Head
Rebuild and Upgrade Process
- Complete disassembly and hot tank cleaning of the cylinder head
- Drilling, tapping, and replacement of oil port plugs specific to SR head
- Machinery work for threaded freeze plugs installation
- Stage 1 porting, polishing, and CNC combustion chamber finishing
- Valve guide removal, reinstallation, reaming, and multi-angle valve job
- Modification and grinding of rockers for dual guide application
- Rocker level setting, head resurfacing, and full reassembly
Included Parts
- Standard size Supertech intake valves
- Standard size Supertech Inconel exhaust valves
- Supertech titanium retainers and dual spring kit rated at 68 lbs
- Supertech bronze valve guides and valve stem seals
- Mazworx threaded and O-ringed freeze plug kit
- Kelford camshaft set (HLA 188-A) with 260° intake and 266° exhaust profiles
- Miscellaneous plugs and freeze plugs
Long Block Assembly
Labor
- Final assembly of long block components
- Engine spin, priming, and oil flow/pressure verification
Additional Parts Included
- Mazworx/Apexi full grommet head gasket (88mm x 1.2mm)
- ATI SR20 RWD street damper
- Complete timing chain kit and Mazworx timing chain tensioner
- Mazworx SR20 engine bolt kit
- Kelford adjustable cam gears (S14/S15 receive one Kelford gear and one OEM VTC gear)
- GReddy high capacity oil pan
- Valve cover powder coating and servicing
- Mazworx valve cover washer kit and miscellaneous seals/gaskets
Important Notes
- A core SR20DET RWD long block is required for this build.
- New rocker arms are not included in the price.
- Your core parts will be evaluated upon disassembly to assess their condition.
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