1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

High comp LS-V keeps blowing head gaskets

Discussion in 'HYBRID -> EG-EK / DC' started by lsvguy, Jul 2, 2009.

  1. lsvguy

    lsvguy New Member

    Messages:
    3
    Likes Received:
    0
    Joined:
    Jul 2, 2009
    Ok, I built a high compression LS-V for a track car. I put high comp race pistons in it, stock LS rods and new bearings. The oil pressure switch is on a T-line on the back of the block running to the correct location on the head.

    When I check the motor with a compression tester, it shoots straight to 300 (the cap of the tester) and bounces there.

    The problem is that it blows the head gasket and starts mixing oil with the water very often. I've replaced the head gasket 3 times in the past 2 days and am getting tired of it.

    Any ideas?
     
  2. lsvguy

    lsvguy New Member

    Messages:
    3
    Likes Received:
    0
    Joined:
    Jul 2, 2009
    Motor is about 14:1 compression just so you know. Tried both GSR and B16 heads, both give the same problem.

    I am running it on the stock head bolts though.
     
  3. Briansol

    Briansol Admins Admin VIP

    Messages:
    21,456
    Likes Received:
    2,117
    Joined:
    Nov 18, 2007
    Location:
    CT
    bolts are probably stretched and allowing the head to lift. get some new bolts and torque in 2-steps as the manual suggests (in-> out half torque; in-> out full torque)
     
  4. lsvguy

    lsvguy New Member

    Messages:
    3
    Likes Received:
    0
    Joined:
    Jul 2, 2009
    Does anyone know off hand what the exact length of the head bolts is?

    I'm considering just getting studs and not having to worry about it anymore.
     
  5. Briansol

    Briansol Admins Admin VIP

    Messages:
    21,456
    Likes Received:
    2,117
    Joined:
    Nov 18, 2007
    Location:
    CT
  6. DESPAIN

    DESPAIN yep....mmhhm.......yep...

    Messages:
    1,703
    Likes Received:
    39
    Joined:
    Aug 1, 2008
    Location:
    flower mound TX
    also might want to check into a cometic head gasket......
     
  7. K2e2vin

    K2e2vin Senior Member

    Messages:
    8,446
    Likes Received:
    92
    Joined:
    Jan 2, 2003
    Location:
    Raleigh, NC
    Is the motor tuned? Have a tuner look into it; there's been some people who've had similar issues with high compression builds; and replacing the head gasket usually caused some sort of rod failure; so I'd look into that first.

    If the tune is good, then definitely try the above suggestions.
     
  8. 97hatch

    97hatch ?

    Messages:
    1,695
    Likes Received:
    20
    Joined:
    Feb 6, 2003
    Location:
    Anderson IN
    yes it could be detonation killing your head gasket and soon it will be rod bearings also i highly advise geting studs also what brand pistons are you runing
     
  9. GlassHeadlights

    GlassHeadlights West West Yall

    Messages:
    4,066
    Likes Received:
    71
    Joined:
    Oct 24, 2007
    Location:
    Calgary, AB
    When the head is off again try to check for warpage if you can.
     
  10. boostin4fun

    boostin4fun Boosted ls/vtec ohh yeah!

    Messages:
    861
    Likes Received:
    10
    Joined:
    Jun 22, 2006
    Location:
    Omaha
    Its definetly wouldnt hurt to check the deck surface and the head with a straight edge and feeler gauge. If the head or deck surface are not straight then you are wasting your time replacing gaskets, because it will never seal right. Like everyone said before you definetly need some arp head studs, factory bolts will stretch from high power builds such as yours. Even little imperfections or gouges in the aluminum on the head and deck surface can keep the gasket from sealing, so inspect it carefully before reassembly.
     
  11. Magana559

    Magana559 The Warden

    Messages:
    2,568
    Likes Received:
    42
    Joined:
    Aug 9, 2008
    Location:
    fresno Ca
    I would ditch the bolts and use studs, In LS-Vtec and B20 Vtec engines you MUST use GSR head studs. No and's if's or but's.

    cometic MLS head gaskets are great, They make one for LS-Vtec builds so you wont blow em any more.
     
Verification:
Draft saved Draft deleted

Share This Page