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Thread: Carb selection

  1. #1
    MANIC MECHANIC
    What, in your opinion, would be the proper carburator choice
    for a 454 with 9.5-1 compression, Holley strip performer intake,
    large oval port heads, log exhaust with 4 inch outlets, risers and tips in a 21ft sleekcraft jet?
    My drag racing buddy tells me that a 800 holley mechanical sec DP will really wake it up, but after doing a search on the tech forums,
    I wonder if that might be a little large for my application,
    I'm currently running a holley vac sec single pump of unknown cfm.
    For a jetboat what is better, vac. or mech. secondaries?
    What cfm would be most appropriate for my eng.?
    Thanks
    Tim

  2. #2
    HammerDown
    Hey Tim, on my 21' Daytona 468 10.5:1 the 715 vac secondary works great at 52-5300 RPM.
    Now I did install/try a double pumper 850 (that I still have)...it did NOTHING!

  3. #3
    SmokinLowriderSS
    My Taylor has been running a 700CFM 4150 mech sec. for 27 years on a 454 (8.5:1 comp). I don't think an 800 is too big, but you may find out the improvements are smaller than you want. "Really Wake Up" may not happen.

  4. #4
    GofastRacer
    What, in your opinion, would be the proper carburator choice
    for a 454 with 9.5-1 compression, Holley strip performer intake,
    large oval port heads, log exhaust with 4 inch outlets, risers and tips in a 21ft sleekcraft jet?
    My drag racing buddy tells me that a 800 holley mechanical sec DP will really wake it up, but after doing a search on the tech forums,
    I wonder if that might be a little large for my application,
    I'm currently running a holley vac sec single pump of unknown cfm.
    For a jetboat what is better, vac. or mech. secondaries?
    What cfm would be most appropriate for my eng.?
    Thanks
    Tim
    With your application an 800 DP will not wake it up, all you'll do is waste gas. A 3310 vac sec will work just fine, smoothe operation and won't suck up the gas for nothing!..

  5. #5
    1BIGJIM
    I have a similar application on an I/O with 9:1 compression. 2 months ago I went to the 750 Mech SEA DEMON. Noticed about 100 RPMs, but it runs smooth. Starts at the click of the key. Expensive but worth every dollar.
    I have an 750 Edelbrock for sale

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