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Rb25 Standard Head Gasket Questions

The Mafia

By The Mafia,
in Engines & Forced Induction

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The Mafia Grand Master

The Mafia

Posted
Posted

Just a quick one guys.

Mate has blown his head gasket and needs a new one.

He's asking me if he needs a 1.2mm, 1.5mm, or 1.8mm. (he's buying aftermarket)

I don't like lowering compression too much because you get bad fuel economy and poor off boost power.

anyway - can anyone tell me what the standard head gasket thickness is, and how much each head gasket above would drop the compression?

Also bare in mind that he's buying a 2835 HKS kit soon, so maybe factor that in.

Thanks

Jono

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NYTSKY Grand Master

NYTSKY

Posted
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Standard thickness is 1.2mm.Dont lower the CR.I know of a few big power cars running stock thickness.Ill be building my motor very soon and will be keeping the stock thickness,and have even got custom CPs which are 9.0:1 (stock CR).And thats with a GT3037 bolted to the side.

And from memory 1.5mm will lower the CR to 8.6:1 with stock pistons.

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