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When building a turbo Subaru motor the engine block is a key reliability concern in applications using more than 10lbs of turbo boost.  Stock block Subaru motors using more than 10lbs of boost have proven to be too weak to handle the extra stress.  With >10lbs of boost each explosion can shake the barrels into a resonant vibration at the top of the barrel.  This resonating of the barrel will eventually wear away the head gasket material to a point that leaks occur.  At this point radiator fluid from the cooling jackets leak into the cylinders, vaporizing and going out the exhaust.  And yes, as the coolant vaporizes you'll have an overheated motor.  Hopefully you'll be watching the temperature gauge and put more coolant in the radiator before you blow the motor from excessive heat.

Outback's closed deck block braces the top of the cylinders which prevents this vibration from occurring.  Without the vibration the threat of worn head gaskets goes away.  As stated in our MOTOR MATRIX, a closed deck block is essential to have a reliable motor with more than 10lbs of boost.  Outback was first to market with our proprietary zero tolerance billet aluminum insert.  Outback has the perfect combination of billet filler and passage holes for coolant to the heads.  This race proven method  provides a superior bracing of the cylinder walls as compared to other cheaper solutions such a plugs with JB weld. When you see the difference and compare our machining you'll quickly understand why it's so much better.  It's simply the best closed deck 2.5L Subaru block on the market.