Engine 302 Looses Torque When Hot

Discussion in 'Classic Mustang Specific Tech' started by 67rcks, Oct 21, 2013.


  1. 67rcks

    67rcks Member

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    302, holley 4777c carb tuned to run 13.5-14.5 AFR anywhere between 2000-3500 rpm (wideband o2 says).
    ign. advance set for best vacuum
    1:2.7 gears, 235/55/r17 tires.
    when driving for a longer trip (50+ miles) it starts to have sloppy acceleration. does not overheat. even old carbureted vw with 1/5 of 302 displacement accelerates faster. what would you suspect?
    #1
  2. woodsnake

    woodsnake Active Member

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    Transmission fluid level?
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  3. Rusty67

    Rusty67 Well-Known Member

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    Does it sputter or is it just a dog ? Could it be vapor lock ?
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