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Old 05-14-2021, 03:20 PM   #1
Aultarius
Scooby Newbie
 
Member#: 512042
Join Date: Feb 2020
Location: Dekalb, Illinois
Vehicle:
1998 Legacy Outback
Red/Gray

Default FB20B/FB25B Technical Specs for build?

Running come calculations on running a FB20B Short block with FB25B Heads to lower compression and turbo, (Just like the EJ22 short block, ej25D head swap of old) Just want to figure the numbers out to see what I'll be looking at for the new compression ratio, I haven't found the head gasket thickness or deck clearance specs among other specifics. I've been using all the normal sites, motorwiki, Wikipedia ect.. I've even looked on ALLDATA (a universal factory service information service independent shops use) and still haven't found much of anything other then bore and stroke, Figured I'd ask here and see if anyone has access to additional resources or knows where I could find the numbers.

If all else fails, I'll just go to a local junk yard and make some measurements.

Thanks!
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