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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.
 Outfront'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. Outfront was first to market with
our proprietary zero tolerance billet aluminum insert. Outfront 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.
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