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whats the best type of head gasket to use and where to get it? i've headrd of the metal ones but theres also different thicknesses and i read in my 'modern automotive technogoly' book that making the combustion chamber bigger will increase my power potential do they seal up as well?
 

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You really cant get much thinner that oem gaskets.
 

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Making your combustion chamber bigger will decrease engine power because it will lower your compression ratio. In a turbo car lowering your C/R will allow you to put more boost to your engine without detination as long as your fuel system will flow enough but will the VG30et's C/R at 7.8:1 from the factory it is already very low.
 
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