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  1. #1
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    Progressive ProMax Intake

    What is the difference between the progressive and non-progressive intakes on the 225 ProMax 2.5l motor? Can you go by year and/or part number?
    Thanks in advance
    Dave

  2. #2
    Join Date
    Dec 2004
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    Frankfort KY
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    I dont know the years but I think the non progressive the butterflies open at the same time and the progressive opens at different times I could be wrong though.
    1998 SS 2000 94 260ss
    Speed cost how fast you want to go
    Allison and Merc is there anything else?

  3. #3
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    Sep 2006
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    Texarkana, Arkansas
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    SSTOM, I believe you're correct. May want to check out this thread as well.

    http://www.screamandfly.com/showthre...-260-injectors
    1992 STV River Rocket - bottle fed 260

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