Mazworx RB25 Short Block Stage 2.5 Service
Mazworx RB25 Short Block Stage 2.5 Service
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Shipping details
In-stock orders are processed within 48 hours; transit time is additional.
International orders include export processing and customs clearance. Duties, taxes and brokerage are extra; final freight charges may change after remeasurement.
Read the shipping policyReturns
Need help with a return? Request authorization within 30 days of delivery for eligible unused, uninstalled items. See details for exclusions and applicable fees.
Read the full return policyReturn details & how to start
Request return authorization (RMA) within 30 days of delivery for eligible items. Keep items unused and uninstalled, with original packaging and accessories. Electronics, liquids, special orders and other categories are excluded.
Email sales@frsport.com with RETURN and your order number in the subject to request an RMA. Please wait for return authorization before sending your item back.
Wrong part/size or change of mind: a 20% return processing fee applies, plus applicable shipping costs.
Original shipping is non-refundable. For orders shipped free, the actual outbound shipping cost is deducted from the refund. Return shipping is prepaid by the customer.
After payment capture, cancellations and refunds generally incur a 5% processing fee, except for our error, confirmed defects or confirmed carrier loss. The 5% and 20% fees do not stack; only the greater applicable fee applies. Store credit waives the 5% fee, but applicable return fees remain.
Missing, incorrect or transit-damaged items: report within 3 business days of receipt with photos of the product and packaging.
For defective items, contact us for help with the manufacturer's warranty process. The manufacturer decides the claim.
Specifications
Product details shared across all variants.
- Category
- Car Repair & Maintenance
- Shipping dimensions (L × W × H)
This service uses customer-provided engine components. A replacement core is not included.
Provide RB25 core short block. Confirm compatibility and condition before ordering.
Service work and components
- Complete disassembly of the short block
- Thorough hot tank cleaning and degreasing
- Sandblasting followed by painting of the iron block for corrosion protection
- Machining for threaded oil port plugs
- Machining for threaded freeze plugs
- RB26 oil groove machining
- Machining to accommodate RB26 head studs
- Inline block resurfacing to ensure precise mating surfaces
- Resizing of cylinder bores using a torque plate for accuracy
- Precision honing of the line bore
- Installation of a Mazworx oil pump collar onto the crankshaft
- Cleaning, inspection, polishing and balancing of the crankshaft
- Final assembly of the short block with high-performance components
- Custom HD CP pistons, 86.5mm with a 9:1 compression ratio
- Upgraded 9310 wrist pins with 0.250″ wall thickness and 22mm diameter
- BC ProH625+ connecting rods with 22mm wrist pins
- ACL RB26 race bearings designed for high-performance applications
- ARP main studs for secure main cap retention
- Mazworx RB oil pump collar
- Mazworx threaded and O-ring sealed small plugs
- Mazworx threaded and O-ring sealed freeze plug kit for secure coolant sealing
Confirm delivery arrangements before sending parts. Work starts only after the individual intake is approved.
Additional work and replacement parts need approval. Core credit requests require individual approval. No automatic core credit is included.
Photos show manufacturer work examples. The service uses customer-provided cores. Selected options and listed components define the supplied work.
