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Old 10-23-2010, 08:24 AM   #1
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Scooby Newbie
Member#: 158523
Join Date: Sep 2007
Chapter/Region: International
Location: AUS
Default EJ205 Block, 20G Heads... Gasket shopping

Swapping an open deck EJ20g from a JDM forester into my na 98 forester. Donor car had a spun big end bearing.. This was known, got a great deal. Found a solid EJ205, and will be swapping the heads and intake manifold onto the 205 block so i can retain the loom and other bits and pieces that i already have sorted out.

So, to maintain as close to stock compression ratio possible, will the stock EJ205 gasket [11044AA483] be a good fit? I'm aware the 20G gasket is 1.37mm due to the pistons rising above the deck at TDC, and the 205 gasket is 0.6mm. I was hoping it would be a simple calculation however the piston surfaces appear to have different castings and i have no idea what sort of volume difference there may be there, if any.
Will this even be an issue, or will it be to small of a variable to upset the ECU? I do plan on running a piggyback ECU in the near future but not immediately.

As for the timing belt, both engines have been recently changed [<10000kms]. I figure I'm better off using the 205 tensioner at the least as it is designed for the lesser overall engine width [would equate to ~1.54mm]?
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Last edited by Join the Riot; 10-23-2010 at 08:41 AM.
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Old 10-24-2010, 03:26 AM   #2
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