We carry a limited range of pistons for this kit in stock. If we don't have your exact requirements it will take 6-8 weeks to have pistons made.

For shipping cost -add all the products you would like, then navigate to the shopping cart to calculate shipping quote.
Nissan RB25/26 Stroker Kit:
- Spool Billet 4340 full counter weight 79mm Stroker Crankshaft
- Spool H or Drag PRO I Beam Forged Connecting Rods with ARP-2000 Bolts (ARP L19 Bolts available as an upgrade)
- CP Custom Pistons (rings, pins and locks included)
- 9310 0.200" Gudgeon Pins standard (0.250" Pins available as an upgrade)
We can supply custom CP Pistons in any bore size or comp ratio - email for details.
Full billet 4340 Nitrided and Balanced Crankshaft
Note: The standard RB26 capacity is 2568cc
Using the 79mm stroker crank, std length conrods and custom pistons, the displacement is increased as follows:
- 86.5mm bore and the 79mm stroker crank = 2750cc / 217cc increase
- 87mm bore and the 79mm stroker crank = 2818cc / 250cc increase
With the increased cubic capacity from the 79mm stroker crank, big increases in torque and low to mid range power are achievable. Boost will come on earlier in the rev range and peak power will increase.
CP pistons come with rings, pins and locks. The gudgeon pins are upgraded to 9310 hardened alloy steel with 4.5mm wall thickness.
Note: Clearancing of the cylinder block is sometimes required.
| Product Name | Spool RB25 - RB29 Stroker Kit with Custom CP Pistons |
|---|---|
| Brands | Spool |
| Engine | RB25 |
| Make | Nissan |
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
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If you have issues calculating freight, please get in touch. We are happy to help.
Disclaimer:
Product images are for description purposes only. Actual product may vary.
Shipping calculations available at checkout.
If you are unsure, get in touch by emailing [email protected], messaging us on Facebook, or phoning us at +61 7 5645 1333 (8am to 2pm AET).
What is included in a typical Spool engine kit?
Kits usually include pistons, rings, rods, bearings and related hardware depending on the engine family. Check the listing for exact inclusions.
Do I still need machining with a full engine kit?
Yes. The block must be honed and all clearances checked and set by your builder. Assembly should only occur after full measurement and verification.
What are the benefits of using the Spool RB25 - RB29 Stroker Kit?
The Spool RB25 - RB29 Stroker Kit increases the engine displacement, providing significant gains in torque and low to mid-range power. The 79mm stroker crank allows for earlier boost onset and higher peak power, making it ideal for performance applications.
What machining is required for the Spool RB25 - RB29 Stroker Kit?
Clearancing of the cylinder block may be necessary to accommodate the 79mm stroker crank. Additionally, ensure that the big-end and small-end of the conrods are honed to the correct sizes for optimal fitment.
Can I customise the pistons in the Spool RB25 - RB29 Stroker Kit?
Yes, the kit includes custom CP pistons that can be tailored to any bore size or compression ratio. Contact us for specific requirements, as custom pistons may take 6-8 weeks to manufacture if not in stock.
What type of conrods are included in the Spool RB25 - RB29 Stroker Kit?
The kit features Spool H or Drag PRO I Beam Forged Connecting Rods equipped with ARP-2000 bolts as standard. An upgrade to ARP L19 bolts is also available for enhanced performance.
What are the specifications of the gudgeon pins in this stroker kit?
The kit comes with 9310 hardened alloy steel gudgeon pins with a standard diameter of 0.200 inches and a wall thickness of 4.5mm. An upgrade to 0.250-inch pins is also available for those requiring additional strength.
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