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Old 09-18-2008, 06:18 PM   #1
Scooby Newbie
Member#: 94099
Join Date: Aug 2005
Chapter/Region: NWIC
Location: Covington/ Ft Lewis WA
2002 WRX 02

Default STI Shorkblock swap... Headgasket size?

I bought a sti shortblock and am planning on putting my 2.0 heads on and doing the whole hybrid thing. I was reccommended the 2.5L headgasket with 1.9mm thickness by gruppe-s. Is there any experienced engine builders out there that can comfirm or dent the size? All the internals (ie cams and such) are stock and its a brand new sti shortblock.


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Old 09-18-2008, 11:20 PM   #2
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Join Date: Nov 2005
Chapter/Region: NWIC
Location: Covington, WA
88 GL-10 STi


if you use the stock EJ257 gaskets you will have a compression ratio of about 8.9:1. if you use the 1.9mm gaskets you will have a compression ratio of about 8.0:1.

the stock SIT EJ257 ratio is about 9.23:1 stock WRX EJ205 is about 8.0:1.

Note: this info is from Matt's ratio calc.

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