Thread: 2009 WRX Engine Build
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  #27  
Old 31-03-2011, 11:13 AM
BALISTC BALISTC is offline
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Quote:
Originally Posted by johnvk7 View Post
EJ257 is semi-closed deck
As is the EJ255 short block.

Block, crank and rods are identical between the two short blocks.

Jeff Sponaugle on NASIOC discovered the only difference between the two short blocks is the factory pistons.. the 257 piston has 22cc dish and the 255 piston has 25.5cc dish.. they differ due to WRX and STi head design being different.
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