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What head gasket for 408?

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Old Apr 2, 2012 | 01:38 PM
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Default What head gasket for 408?
Was wondering if I can run this headgasket on my 408 LS3 headed build? 4.060 bore. http://www.summitracing.com/parts/TFS-30694060-045/
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Old Apr 2, 2012 | 01:44 PM
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Engine is a LQ4... with pistons .005-.007 out of the hole, bored .030" over
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Old Apr 2, 2012 | 02:28 PM
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Yes. That's fine. What are your heads specs? I'm going to run a 4.160 408 with 230 AFR heads to clear the head chambers
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Old Apr 2, 2012 | 02:44 PM
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Stock 821 castings, LS3 69.8cc chambers
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Old Apr 3, 2012 | 12:40 AM
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anyone else' opinions?
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Old Apr 3, 2012 | 02:37 AM
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No that is not fine. You need at LEAST 4.065 bore. You will have to run a 4.080-4.085 bore gasket. If you do not the gasket will leak.
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Old Apr 3, 2012 | 12:01 PM
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why won't it seal? I thought .030" over the bore size was recommended?
Last edited by Fast 95 Z28; Apr 3, 2012 at 01:48 PM.
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Old Apr 4, 2012 | 12:15 AM
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i asked texas speed if i could run the 4.060" gasket and Aaron there said it would be okay. I'm just confused now since he said it would be fine and the other person told me it needs to be 4.080". I need more input on this!
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Old Apr 4, 2012 | 08:59 AM
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Ls9 headgasket. Thats whats in my 408 and most of the other ones on here
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Old Apr 4, 2012 | 11:07 AM
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thanks, do they make an LS9 gasket at .045" compressed thickness? Still want a .045" gasket.
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Old Apr 4, 2012 | 11:38 AM
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I think the ls9 is close to that... iirc its .050
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Old Apr 4, 2012 | 11:46 AM
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We use Cometics in our engine shop, 4.130" bore in either .027/.040/.051 on 408 builds. Nothing but great luck!
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Old Apr 4, 2012 | 07:06 PM
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Because the chamber size is a tad bit bigger or right on the edge of 4.060 as it is. The fire ring may not seat well. As Jesse at Scoggin Dickey, they sell them all the time.
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Old Apr 6, 2012 | 06:05 PM
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Would this gasket work? http://www.summitracing.com/parts/FEL-1041/ and is .034" quench running it to close on a street 408? i measured my pistons and they range from .005-.007 out of the hole.
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Old Apr 6, 2012 | 06:32 PM
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Why are you so against the cometics? You should use a 4.085 gasket in any thickness you want. Thats it. As long as you abide by that you are ok. No need to complicate it with a 4.100 or larger gasket, you have the answer in front of you. SD can get you the gasket you need.
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Old Apr 7, 2012 | 10:23 AM
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I'm just under a budget and wanted to order everything from the same site to same all the hidden shipping costs. I'll prolby just end up ordering the Cosmetic LS1 4.085" gaskets from texas speed.
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Old Apr 7, 2012 | 05:50 PM
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FYI you can order everything you could ever want from Scoggin Dickey.
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