Hedman and Pypes

Discussion in 'High Performance Modifications' started by Z71Dav, Apr 18, 2014.

  1. Z71Dav

    Z71Dav Member

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  2. krabben1

    krabben1 Veteran Member Lifetime Gold Member

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    Both systems are good.I run the hedmans with the pypes system with the transverse muffler on a bb.Quiet while idling,louder as you go into the pedal.
     
  3. Z28zz383

    Z28zz383 Veteran Member

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    That will be a nice system....Call hedman or summit to verify the fast burn heads are going to match up with the header tubes. I believe they will be since they are 1.75 dia. Fast burns have a higher exh. port.
     
  4. JWZ28

    JWZ28 Veteran Member

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    As far as mufflers go I love my Pypes Race Pros. Good rumble at idle, no drone at cruise, and scream when you mash the loud pedal.
     
  5. doublec

    doublec Veteran Member

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    I have Hedman 65104s and the Pypes Race Pros..love em.
     
  6. toddoky

    toddoky Veteran Member

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    Although the ZZ4 heads are a D-port design, they are not the Fastburn heads. All the GM D-port heads(LT1, LT4 and ZZ4) are raised .100" with the exception of the Fastburn heads, which are raised .200".

    The Hedman headers (and most other mass produced headers) are designed primarily for "stock port" heads (i.e. non-D-port), so even though they will definitely bolt-up and probably not leak, the possibility of shrouding at the roof of the port will exist. If that is important to you, you can create a port trace template and overlay it across the header flange to determine the amount of shrouding that will be present if any.
     
  7. krabben1

    krabben1 Veteran Member Lifetime Gold Member

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    Do you work for GM at the corvette plant?
     
  8. toddoky

    toddoky Veteran Member

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    No krabben1 I don't work for GM. I work at Holley here in Bowling Green.
     
  9. krabben1

    krabben1 Veteran Member Lifetime Gold Member

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    Damn.There goes my in for a new vette,lol.
     
  10. Z71Dav

    Z71Dav Member

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    Any recommendations for the D-port heads ? There doesn't seem to be too much there that will fit the 81 Z28 and D-port. Ive searched and was told the Hedmans I listed will work fine.
     

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