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  #1  
Old 09-17-2011, 06:53 PM
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SuddenDeath SuddenDeath is offline
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Default Help needed with SD's Roush engine

I finally have the car stripped down for paint. I don't plan on a complete rebuild of this engine, but am planning on new heads.

Basic specs: 4.39 bore, 4.15 stroke, Roush crank, carrillo rods, BRC pistons, 4 bolt block, D3VE heads w/2.25's, adjustable valvetrain, cleaned up ports, solid roller.

Pistons appear to be 18cc dish? There is an old part number on them: BRC 58

As you can see the decks (and old heads) are O ringed. This, along with the larger chamber D3VE heads/dished pistons were part of going to twin turbos which were on the car when I got it. They were done in 1981 by Jack Roush.

With the process of going back to NA, I'm planning on new Blue Thunder aluminum heads, ported/flowed. I would rather not have to groove them for O rings if at all possible.

My question: Can I remove the existing O rings and run a larger diameter bore head gasket safely? I was thinking a 4.67" bore gasket would put the sealing ring outside the existing O ring groove. OR, could I install a smaller diameter O ring material which would not interfere with the head gasket once compressed?

Just looking for options that would be acceptable to avoid grooving the new heads if possible without requiring an entire engine teardown/decking the block. The engine runs perfectly with no issues, so I hate to disassemble the bottom end unless I have to.

Here is a photo of the existing O ring/piston:



Thanks for your expertise! I want to get this right.

Tom

Last edited by SuddenDeath; 09-17-2011 at 06:55 PM.
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  #2  
Old 09-18-2011, 12:44 AM
TorinoStyle2 TorinoStyle2 is offline
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J.B Weld!!...
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  #3  
Old 09-20-2011, 04:32 PM
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SuddenDeath SuddenDeath is offline
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That isn't the kind of help I'm looking for..thanks.
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Old 09-20-2011, 05:30 PM
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I have a set of C8's that have been machined down to a 52CC chamber and were run on a 16+:1 CR motor that we o-ringed. I'm using them on a much milder combo now and my machinist said pull the o-ring and run them. I did and I am and there's no problem with them leaking @ 11.2:1 with a factory type gasket.
Rob
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Old 09-20-2011, 09:34 PM
Flatrod Flatrod is offline
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I would pull the wire and run a Comtec as close to bore size as possible. Or, if you know the wire size (.041?) pull the stainless wire and replace with a soft copper wire and still use the Comtec gasket.
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Old 09-21-2011, 10:31 AM
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SuddenDeath SuddenDeath is offline
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WhiteLightning and Flatrod...thank you!! Thats the kind of info I was hoping for!! That'll get me on the right track.
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Old 09-21-2011, 04:43 PM
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Speaking of my machinist.......lol
Rob
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  #8  
Old 11-13-2011, 08:18 PM
3MTA3 3MTA3 is offline
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Default Gasket

Run a copper gasket and leave the wire in place. No need to groove new heads. Have done this on many engines with no problems.
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  #9  
Old 03-29-2012, 06:28 PM
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Wow,just got on here for the first time in a while. Sorry to hijac, but "sudden death" is still around? Loved reading about this car.
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Old 04-19-2012, 07:03 PM
HotRodLincoln HotRodLincoln is offline
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Totally O/T, but those are some interesting pistons. I wonder if some clever custom work was done on the heads?

Looks like they have a symmetrical circular quench design, which is what GM came up with for their LS after $$$$$$$$ of research.
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