The Engine Rebuild Kit includes all essential components for a full engine restoration, such as gaskets, pistons, main bearings, rod bearings, and more. Crafted from premium-grade alloys and advanced materials, each component in the Engine Rebuild Kit is built to withstand high temperatures, heavy loads, and extreme conditions for long-lasting performance. Designed to meet or exceed OEM specifications, the Engine Rebuild Kit ensures a perfect fit, allowing for smooth installation and optimal performance without modifications. This kit helps restore engine compression, reduce oil consumption, and enhance fuel efficiency, delivering smoother operation and increased power output. Every component in the Engine Rebuild Kit undergoes rigorous testing under real-world conditions to guarantee consistent and dependable results. Remark: Does not fit 07-12 IMPREZA WRX STI 2.5L EJ257. For the main and rod bearings of the engines, 2 variations existed. For the main bearings, the thrust washer is either located at the #3 position (middle) or the #5 position (bottom). For the rod bearings, the shaft/journal size is either 48mm or 52mm. This listing offers main bearing set with the thrust washers at #5 position and rod bearing set with 52mm journal size. Please check with your professional installer if you are unsure on which set your engine takes.

This item includes:
Full Gasket Set (Multiple Layers Steel (MLS) Head Gasket, Valve Cover Gasket, Valve Stem Seals, Intake Manifold Gasket, ..., Other Small Gaskets, RTV Silicone)
12 Cylinder Head Bolts
4 Pistons with Complete Ring Set (standard size)
Standard Bore Diameter: 99.50mm
1st Group: 1.20mm
2nd Group: 1.20mm
Oil Ring: 2.00mm
4 Piston Wrist Pins
8 Cir Clips
Main Bearing Set - Thrust washers at #5 position (Standard Size)
Rod Bearing Set - 52mm journal (Standard Size)
1 Timing Belt (281 teeth)
1 GMB Tensioner (bearing & hydraulic cylindrical integral)
1 GMB Upper Idler (bearing)
1 GMB Lower Idler (bearing with inner flange)
1 GMB Upper Idler (small bearing. outside diameter 31mm)
1 GMB Lower Idler (sprocket with bearing)
Water Pump w/ Gasket (2 outlet pipes)
Oil Pump