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Old 09-29-2007, 02:55 AM   #51
SaabTuner
Scooby Specialist
 
Member#: 67608
Join Date: Aug 2004
Location: SoCal
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They (V8 STi and USDM STi) are NOT forged. It can be clearly seen in the lack of pressure-deformation in the grain of the broken piston.

The grains will flow perpendicular to the surface in a broken forged piston and it's very easily visible.

I'm surprised this thread has survived argument so long with such good data pointing to the change to castings.
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