Pulling my hair out, hours to decide.....ported 289 or stock GT40 w/ roller rockers

Discussion in 'Technical' started by Mustangnut, May 21, 2014.

?

Which heads!!!!!!

  1. GT40 Roller rocker heads

    15 vote(s)
    71.4%

  2. Ported, valve job, 289 small chamber heads

    6 vote(s)
    28.6%
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  1. Mustangnut

    Mustangnut Member

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    Finally test drove it a short distance. Definitely has more power. My intake is still holding me back but way better then the stock heads I had. I did notice at speed I would develope a bad vibration....seemed rotational so I'm guessing my new shortened driveshaft is out of balance. After a look over I noticed a motor mount bolt worked itself out. Anyone have the size of that bolt?
     
    Mustangnut, Jun 2, 2014
    #16
  2. baddad457

    baddad457 Member

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    The Mount bolts in the block are 7/16NC x 1" or close to that length
     
    baddad457, Jun 2, 2014
    #17
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