Spool Ford Barra / XR6 Turbo / 4.0L DOHC - 3.7L 90mm De-stroke Kit

Kits usually include pistons, rings, rods, bearings and related hardware depending on the engine family. Check the listing for exact inclusions.

Yes. The block must be honed and all clearances checked and set by your builder. Assembly should only occur after full measurement and verification.

The Spool 90mm Stroker Kit reduces the engine's cubic capacity to 3.7 litres, allowing for a higher rev range and improved throttle response. This can be beneficial for applications where weight and balance are critical, such as in motorsport or performance builds.

Clearancing of the cylinder block is sometimes required to accommodate the new crankshaft stroke. Additionally, ensure that the big-end and small-end of the conrods are honed to the correct sizes for a proper fit. Always check for adequate clearance with the pistons as well.

The kit includes CP Extreme Boost Forging 2618 forged pistons with a standard compression ratio of 10:1. However, custom pistons can be arranged for different bore sizes and compression ratios, subject to a surcharge.

Yes, the Spool H Beam forged connecting rods come standard with ARP-2000 bolts, but you have the option to upgrade to ARP L19 bolts for enhanced strength and reliability, particularly in high-power applications.

If the specific pistons you require are not in stock, it typically takes 14-20 weeks for custom CP pistons to be manufactured to your specifications.