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Thread: Head Gasket

  1. #1
    Member maxwell6's Avatar
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    Head Gasket

    Wondering if I have a blown head gasket. This is the third time I pushed antifreeze out of the reservoir. It seems to be pushing past the 16lb cap. It only happens when i am wot or pretty close to. Other than that it runs fine. It is not over filled i left it down a bit after the last time it did it. And does not loose any antifreeze other wise. 4.6l 2v built with ported P I heads comp cams Trickflow Intake. Vortech Supercharged 14lb @550 rwhp. Anything else that might cause this issue. Thanks for any input.

  2. #2
    Club Supporter Laffs's Avatar
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    You're pressurizing the coolant system somehow. If it's only under boost and not mixing coolant/oil you might be lifting the heads under boost. Are you studded or running factory head bolts? I'd start with a leak down test see what results that yields.
    Quote Originally Posted by ludacris View Post
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  3. #3
    Posting and liking.... Ponyryd's Avatar
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    ^Agree with above. Sounds like either heads or intake are lifting under boost. Could try turning the boost down a few psi.

  4. #4
    Member maxwell6's Avatar
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    Heads are studded

  5. #5
    Member bbriann's Avatar
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    Just a thought...
    I ran into a situation a few years on my 2v that the heater core was collecting all the crap in the coolant system over the year to point where it blew off the hoses 3 times till i figure out what was going on...might be wourth trying back flush heater core or with hand on heater core inlet hose visually look at change in size a you rev engine ip...mine was quite noticeable...

    Little 2V 700+ RWHP, Pump Gas
    10.46 sec @ 136 mph

  6. #6
    Admin ZR's Avatar
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    ^ could be exactly that, doing it before stat is fully open.

  7. #7
    Member maxwell6's Avatar
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    Thanks I will check into it. Planned on doing a flush and fill and rig something to power flush the heater core.

  8. #8
    Member bbriann's Avatar
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    Quote Originally Posted by maxwell6 View Post
    Thanks I will check into it. Planned on doing a flush and fill and rig something to power flush the heater core.
    Yep i rigged garden hose to heater core outlet and inlet to floor drain
    and could not belive accumulation of stuff came out...after that the inlet hose stopped getting rock hard and expanding by 25%...

  9. #9
    Member maxwell6's Avatar
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    This might explain why my system it pressurized all the time. Should it be pressurized constantly even after sitting cold.

  10. #10
    Admin ZR's Avatar
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    Well worth the effort to check. Be x tra careful getting those pesky plastic clips off the hose retainers (both sides must be released at same time, gently pull the hose off) without cracking the alum pipes.

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