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Old 09-06-2007, 10:55 PM   #8
Scooby Newbie
Member#: 145025
Join Date: Apr 2007
Chapter/Region: MWSOC
Location: Racine/Kenosha Wi
1992 Typhoon
06 wrx built to the hilt!


Sorry it took me so long, but piston difference, I see so far:

WRX Piston:

Crown to bottom of skirt 51.6mm
dish depth ~4.75mm
Valve relief depth ~5.25 mm

STI Piston
Crown to skirt 51.3 mm
dish depth ~4.68 mm
Valve relief ~5.05 mm

I hope this helps, I'm looking for a set of STI heads and I can give you differences between the 3 (2002-5 wrx, 2006-7 wrx, 2004-7 sti)
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bearpaws1973 is offline   Reply With Quote