Eg207 heads with 257 block
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This is a discussion on Eg207 heads with 257 block within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; What problems I'll have with using Wrx heads on a nitrate crank 257 block? It's in a Wrx 02 bugeye ...

  1. #1
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    Eg207 heads with 257 block

    What problems I'll have with using Wrx heads on a nitrate crank 257 block? It's in a Wrx 02 bugeye

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    Moderator Donkey's Avatar
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    Using JDM EJ207 heads will change the compression ratio.
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    Compression ratio will be changed. Cosmetic gasket. Arp studs.

    Problems?

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    Quote Originally Posted by soundboy View Post
    Compression ratio will be changed. Cosmetic gasket. Arp studs.

    Problems?

    That can work. The general consensus is you'd be better off having the combustion chambers worked over to lower compression rather than running a thick gasket. The detonation threshold would be lower, and the OEM gasket seals better.

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    How's the Best way to lower it?
    Different pistons?

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    Quote Originally Posted by soundboy View Post
    How's the Best way to lower it?
    Different pistons?

    Opening up the the combustion chambers, in the heads. Either have them cc matched to the 2.5L heads, or at least have edges taken off where they will have a tendency to hot spot.. if you're wanting to run higher compression.

    What kind of fuel do you plan on using?

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    Port and polish then?

    92 or 95 octain.
    I'm not in the us.
    I have access to wstermeth. Planning on using the aem v2 kit

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  9. #8
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    You'd be better off working a set of EJ257 heads
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