B303 1.7rr Gt40p

Discussion in 'Fox 5.0 Mustang Tech' started by bigdavetalldave, Jul 31, 2013.


  1. bigdavetalldave

    bigdavetalldave Member

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    Did some googling, but I couldn't find a straight answer. I've torn down the motor, found I had a b303. I know alphabets aren't the greatest, but I'm sticking to a budget. I've got a set of gt40p's and I need rockers. Are 1.7's gonna cause ptv issues?
    #1
  2. RangerJoe

    RangerJoe Advanced Member

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    Measure your piston to valve clearance with the 1.6's, then figure out how much extra lift you will have with the 1.7's. That should give you an idea. Then, REMEASURE when/if you go to the 1.7's and confirm you have enough.

    Joe
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  3. J-mo

    J-mo Member

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    What year is the block? Stock pistons?
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  4. 88LX5.Oh

    88LX5.Oh Advanced Member

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    I think you end up with .510 of lift with B cam and 1.7 RR's
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  5. bigdavetalldave

    bigdavetalldave Member

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    Stock pistons. 91 block.
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  6. bigdavetalldave

    bigdavetalldave Member

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    They're fly cut
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  7. J-mo

    J-mo Member

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    I'm runing 1.72 with a b303 with stock pistons so if yours are fly cut then 100% positive you'll be good
    #7
  8. J-mo

    J-mo Member

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    You will have to change pushrods due to high ratio RR's.
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