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Old 04-03-2010, 04:08 PM   #35
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


s20 is USDM WRX 2.0L castings
b25 / v25 are USDM 2.5L ej257 (STi engine) castings no real differences between B and V25's that have any impact on performance
d25 are USDM 2.5L ej255 (all 2.5L turbo engines not in an STi) castings. These chambers are a little more rounded and smaller volume (so higher compression ratio) than the b25 / v25 heads.
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