The Subaru Forester Cylinder Head essentially closes the engine cylinders (combustion chambers). Moreover, it allows fresh air fuel in and burned gases out to maintain power and control temperatures. The first models were versions with a cast iron Cylinder Head due to the strength of cast iron. However, many later models adopted a lightweight aluminum Cylinder Head casting that dissipated heat faster. It also improved the power to weight ratio of the vehicle, which let the engine run safely at a higher compression. Whether made of aluminum or cast iron, each Cylinder Head incorporates spark plugs, passages for intake and exhaust, pathways for coolant, as well as the valvetrain in such a way that restrictions are minimized to enhance airflow and obtain higher horsepower. To maintain this seal, Subaru specifies the use of single-use Torque to Yield head bolts that stretch to their limit. This evenly distributes clamping force across the gasket to minimize risks of coolant or oil leaks, misfires, or burnt valves. When there is warpage, cracked guides, or weak valve springs that allow compression to escape, these can cause the Cylinder Head to overheat. In a Subaru Forester, this may result in loss of compression or even a dead cylinder. This is a sure sign to repair or replace the Cylinder Head so that every Forester is back on the road in no time at all.
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