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Sir Head On My B16a2

Discussion in 'HYBRID -> EG-EK / DC' started by Pewble, Mar 29, 2003.

  1. Pewble

    Pewble Senior Member

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    Yo I got a 99 Civic Si and im swapping a JDM Civic SiR Cylinder Head that has:

    3 angle valve job , swirl marked valves , shaved valve guides both intake and exhaust ports ,

    intake ports were opened up 3mm all the way around, intake ports are sand blasted , knife edged

    intake and exhaust ports, fully polished combustion chambers , cylinder head is CFM'c and CC'ed

    to make sure all combustion chambers are even and exact. I am wondering a few things about

    this swap. The cylinder head is also milled. Can replacing the head raise compression, and/or can a head

    gasket raise compression? I am also assuming raising the compression of the pistons and/or boring

    them out can provide an enormous power increase especially with this head.. is this true?
     
  2. B16

    B16 Super Moderator VIP

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    god is the only one who knows what you will run by putting that head on, people must realize there is much more to it, than saying "with x and x mod, how fast will my 1/4 be?" put it on and find out, only way. to raise compression you can get a 1ply head gasket, which will bump you up .3-.4 or you can mill the head. the better way to raise your CR is to replace the pistons, if you mill the head, you can't go back :)
     
  3. Pewble

    Pewble Senior Member

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    How about a Multi layer head gasket? Im guessing I want single ply to lower the clearance from stock for higher compression. Is there a "best" head gasket or a good one for my application (Norimally Aspirated Power) . .. WAIT!!! ... If the Head is milled that means it will provide higher compression than stock without the need of a gasket?
     
  4. B16

    B16 Super Moderator VIP

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    OEM head gaskets are fine for NA (3 ply), for a thin one for higher CR get a mugen or spoon. i would recommend getting pistons before milling the head. milling the head would have the same effect as a thin gasket, but you can get higher CR's from milling the head. i would us milling the head as a last resort.
     
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