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Using thicker head gaskets to lower compression on a stock internal??

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Old Oct 5, 2005 | 07:18 AM
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Question Using thicker head gaskets to lower compression on a stock internal??

Will it work?

I've seen other vehicles lower their compression using thicker head gaskets without building the internal. Will it work on the VQ? By using Cometic Gaskets. Havent heard anyone done it yet so was wondering.


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Old Oct 5, 2005 | 07:39 AM
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let me know what happens..
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Old Oct 5, 2005 | 07:44 AM
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its been discussed in one of the threads, I think the final sentiment was that its a band aid remedy and not truly addressing the problem
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Old Oct 5, 2005 | 08:59 AM
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Originally Posted by tonio
its been discussed in one of the threads, I think the final sentiment was that its a band aid remedy and not truly addressing the problem
Agreed, but a bandaid is still better than bleeding everywhere If you try it let us know how it goes.
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Old Oct 5, 2005 | 09:40 AM
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I think going with a thicker gasket would throw off the variable timing on the vq....same as if you shaved the head for more compression. There is very little play room.
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Old Oct 5, 2005 | 09:46 AM
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A thicker head hasket will reduce the SCR ; however, it negatively effects the chamber's squish volume as desingned into the modern combustion chamber. Minimal squish volume provides superior knock tolerance. It is actually possible to reduce knock tolerance even when reducing SCR, if adequate squish is not accounted for. The recommended method for SCR reduction is are shallow dished pistons.

If you want more info on the topic , have a look in the Corkey Bell book , "Maximum Boost",
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Old Oct 5, 2005 | 10:09 PM
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Originally Posted by g356gear
...same as if you shaved the head for more compression. There is very little play room.
Thats what I found out too. Went to the shop thats currently installing my S/T the same question. They told me it will not make such a big difference, so its not worth the labor. For the labor that I will be paying swapping the head gasket...might as well change out the pistons and rods.

Guess theres no cheap way of playing with boost then.

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