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Old 01-21-2010, 08:54 AM   #1
DOHC_Holiday
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Default DOHC block (O-ringed), SOHC heads: Which Head Gasket?

I am in the process of turboing my Forester, and I have a built engine going in. It's a DOHC block from a 98 Impreza (JE pistons, forged rods) that I am paring with a set of SOHC heads (from a 2001 Legacy GT). The block has been O-ringed.
When I put all this together, which head gaskets do I want to use? DOHC or SOHC? Do you match head gaskets to the block or the head?
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Old 01-21-2010, 06:55 PM   #2
DOHC_Holiday
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T.t.t.
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Old 01-21-2010, 08:45 PM   #3
john 1badSTI
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what do you mean its o-ringed--did you install ductile sleeves? can you post pics because it would not be very efficient to oring the aluminum lip on a stock block.
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Old 01-22-2010, 09:12 AM   #4
DOHC_Holiday
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Quote:
Originally Posted by john 1badSTI View Post
... to oring the aluminum lip on a stock block.
That is exactly what I have.
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Old 01-22-2010, 12:52 PM   #5
VIsubi
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I think he means the metal ring which is a metal o-ring per say. Should be a problem other than cooling issues..hondas have this issue with swapping heads and blocks ports line up but not all line up. I'd stick with what it is. What you could do is get a thinner stronger..more or less copper or the like head gaskets and bump compression a bit..spray the gasket with gasket bond a few times before..that will help with cracks later down the road.
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Old 01-23-2010, 11:12 AM   #6
Patrick Olsen
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I'm assuming this built block has custom, low CR pistons? With the stock pistons, you would have to use the thick DOHC gasket, because the pistons actually protrude from the deck slightly at TDC. With custom pistons that may no longer be the case, but I would still think that the thicker DOHC gasket would be the safer bet.
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