Votec Heads with Square Exhaust Port??

Discussion in 'High Performance Modifications' started by RockinZ, Jan 21, 2010.

  1. RockinZ

    RockinZ Veteran Member Gold Member

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    Oct 18, 2008
    Montreal, QC, Canada
    Vortec heads are not square bore stock are they?
    Now I know why I have exhaust leaks at the exhaust ports. Pretty sure my headers are oval port.

    So am I screwed or what? Have a look...

    [​IMG]
     
  2. I bought a set about five years ago for my boat and the ones I recieved have the sideways D exhaust ports, but I have seen pics of new Vortecs that dont have the D exhaust ports, so I dont know if it was a running design change or what. I know the Bowtie Vortecs heads don't have the D exhaust ports. Maybe you should ask Dirt in the Vortec sticky.:bowtie:
     
  3. sooner

    sooner Veteran Member Lifetime Gold Member

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    Mar 11, 2009
    Perry,Ok
    looks to me like someone just matched them to the factory square gaskets. If thats the case I think you will have a tough time making an 1-5/8 primary header seal up.
     
  4. RockinZ

    RockinZ Veteran Member Gold Member

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    Oct 18, 2008
    Montreal, QC, Canada
    Yeah that's what it looks like. So what can I do? buy 1-3/4 headers?
     
  5. AJ_72

    AJ_72 Veteran Member

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    Jul 3, 2003
    Chebanse, IL USA
    Ouch. :eek:

    That's gotta hurt the old pocket book.

    Yet another fine example of why one shouldn't gasket match. Port matching is the preferred method.
     
  6. enjoideviantly

    enjoideviantly Veteran Member Lifetime Gold Member

    yeah stock vortecs are not square.

    If it were me in your situation, I would check into new heads vs new headers?
     
  7. sooner

    sooner Veteran Member Lifetime Gold Member

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    Mar 11, 2009
    Perry,Ok
    While there may be options other than buying bigger headers, I can tell you that I tried to save a few bucks when I built my motor and use the factory square port MLS manifold gaskets on my 1-5/8 headers and it sounded like a paper sack stuck in a fan.
     
  8. Dirt Reynolds

    Dirt Reynolds Veteran Member Lifetime Gold Member

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    Jan 17, 2003
    BC, Canada
    This is the stock L-31 Vortec exhaust port:

    [​IMG]
     
  9. Damon

    Damon Veteran Member

    12,847
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    Nov 16, 2000
    Philly area
    Factory Vortecs have a roundish-square shape. But that's clearly had work done to it- not the factory casting finish inside. Looks like it's been opened up and fully squared off.
     
  10. RockinZ

    RockinZ Veteran Member Gold Member

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    Oct 18, 2008
    Montreal, QC, Canada
    What are my options other than stepping up header size?

    There seem to be very few square port headers.
     

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