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Old 08-03-2008, 05:38 AM   #1
Jimmy168
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Member#: 173614
Join Date: Mar 2008
Chapter/Region: SCIC
Location: California
Vehicle:
2007 STI
WRB

Default Sleeve vs Bore the ej257 which one is better?

I am wondering i should bore or sleeve my short block for my 07 sti? cuz right now my cylinder was little bit scratch due to one of the piston cracked. If in case of bore my cylinder, do i really need to have a oversize piston if my engine only have 9000 miles on it? cuz i bought a set of standard size piston. is it possible to keep using standard size piston after bore
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Old 08-03-2008, 01:26 PM   #2
reddevil
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Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

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How bad a scratch? Thats the question. And it has too be REALLY bad not to be able to bore out. Sleeving is out of the question, totally not needed.

Often you can hone a scratch out and still use stock size pistons. You really need to just take it to a machine shop and have them inspect it.
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Old 08-03-2008, 07:50 PM   #3
methaddict
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Member#: 159738
Join Date: Sep 2007
Chapter/Region: SCIC
Location: Socal
Vehicle:
2004 WRB STi
Full Race TS, BW 8374 EFR

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Just buy 100mm pistons send it in to the machinist to properly bore the block to the correct p/w clearances. Make sure they check for the deck straightness and ra surface of 20 or better.
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