whats the difference between...

Discussion in '1994 - 1995 Specific Tech' started by 1105, Dec 4, 2003.


  1. 1105

    1105 I AM the random post master...bow down

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    o-ringed and non o-ringed heads?
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  2. 331 cobra

    331 cobra New Member

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    O-ring heads have four circular grooves milled in to the deck surface surrounding each cylinder. You have to use a special gasket that has o-rings in it.

    The o-ring is a better seal if your cylinder pressures are very high, like supercharged, N2o or just bad detonation.

    Unless you plan on boost or big shots of N2o, it's probably not needed and it just adds expense and possibly inconvienience when you pull your heads (special order gasket at most places).
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  3. 1105

    1105 I AM the random post master...bow down

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    I plan on doing a turbo setup on my car and will probably run about 10-12psi of boost. Will non o-ringed geads stand up to that if they are installed right?
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  4. snakeIs

    snakeIs Founding Member

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    If installed right IE the right gaskets and ARP studs. You will have no problems. O rings to me are a waste of time unless you are running serious boost (18-20psi) or tons of squeeze. I have always built motors with the fel pro 1011-1 or 1011-2 gasket and ARP studs and I have cracked pistons and blocks before the HG blew. Its all in the tune, the machine work and the install. Even though they tell you to install them dry, I always use Permatex Copper Spray on my gaskets, that stuff DOES make a difference and its works!! I detonated my 306 last year on 12psi so bad that it cracked my block in the #8 sleeve and took a chunk out of the piston, but the head gasket was fine.....
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  5. VibrantRedGT

    VibrantRedGT "STANGNET'S PENGUIN SMACKER" Super Mod

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    Also I would rather blow a head gasket vs blowing the motor. Unless your getting nuts with boost then don't consider it.
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  6. Trick95

    Trick95 Founding Member

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    Exactly my thoughts.
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