Holley questions
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Holley questions

  1. #1
    NW Spectraholic Malcolm's Avatar
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    Question Holley questions

    Anything wrong with building a 650dp into a 750 with those Proform main bodies? Or would I be better off to stick with the stock style 800dp that's on it now? I'm still Olds powered for now at around 425 hp.
    Malcolm

    75 Spectra 18
    77 Spectra 19 project

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    Senior Member Bigblockbill's Avatar
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    stick with the 800 dp
    24' Eliminator Fundeck

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    Senior Member wajetboy's Avatar
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    how is the boat coming along malcolm i keep forgeting to ask?
    1978 Southwind Tunnel Dragster/1980 SWTD center steer

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  6. #4
    NW Spectraholic Malcolm's Avatar
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    The 800 is running pretty rich. I could jet it down, but I like the looks of that nifty new main body and they don't seem to make one for the 800s.
    Last edited by Malcolm; 03-20-2008 at 08:10 PM.
    Malcolm

    75 Spectra 18
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    NW Spectraholic Malcolm's Avatar
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    Hey Austin,
    Not much progress yet. I need to get the engine out of the 18 and freshen it up to put in the new boat. I can't get near the shop yet though... Too much work to catch up on.
    Malcolm

    75 Spectra 18
    77 Spectra 19 project

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    Senior Member hotbo's Avatar
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    i really like the main bodys have used several on the 750s and 1 850.


    the 800 imo is really over kill for the olds.but your boat and you decide.good luck either way will be good

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Hey hotbo, telling people their carb is too big is MY territory.

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    Cantard 71hallett's Avatar
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    I have used a couple pro-form carbs, they work very well and are usually worth something on the dyno over a standard holley. I would go with the main body. My .02
    Paul

  11. #9
    cfm
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    Quote Originally Posted by hotbo View Post
    the 800 imo is really over kill for the olds.but your boat and you decide.
    Quote Originally Posted by SmokinLowriderSS View Post
    Hey hotbo, telling people their carb is too big is MY territory.
    IMHO, An 800 is not too big for a 425hp Olds 455. Especially if using a dual plane intake.

    If a 750 is 'faster' than an 800-850 in this application, it will be because of better fuel metering, not airflow. IE: In that case the 800-850 needed better calibrating.

    On the same note, that's why the Proform's seem to do pretty well on average. Many times they get better and more consistent metering across the rpm range in comparison to old Holley's.

    Sometimes it's the part, sometimes it's the tuner, sometimes it's both.

  12. #10
    Senior Member hotbo's Avatar
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    Quote Originally Posted by cfm View Post
    IMHO, An 800 is not too big for a 425hp Olds 455. Especially if using a dual plane intake.

    If a 750 is 'faster' than an 800-850 in this application, it will be because of better fuel metering, not airflow. IE: In that case the 800-850 needed better calibrating.

    On the same note, that's why the Proform's seem to do pretty well on average. Many times they get better and more consistent metering across the rpm range in comparison to old Holley's.

    Sometimes it's the part, sometimes it's the tuner, sometimes it's both.
    you got it cfm but wow proform thats suppose to be junk right,kidding

    we can all agrue over carbs,you do what you think is best and it will be right

  13. #11
    Senior Member H20MOFO's Avatar
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    Does it concern no one they aren't uscg approved, I realize running an open engine compartment it doesn't matter"that" much. Or maybe I'm missing something, could you pull the j tubes out of a marine holly and put in the proform, to keep leo off your a$$?
    Another Hot Boat refugee

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Does it concern no one they aren't uscg approved, I realize running an open engine compartment it doesn't matter"that" much. Or maybe I'm missing something, could you pull the j tubes out of a marine holly and put in the proform, to keep leo off your a$$?
    The wrench for the scoop is at home right?

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    Hey Malcolm I use one on my 425 seems to be a decent piece did have a couple little issues with the metering blocks and float bowls mating up (caused one float bowl to seep) but a little filing and it works fine. On the flip side if I had a bigger carb. laying around I probably would have used that. Let me know if you have any more questions about it.

  16. #14
    NW Spectraholic Malcolm's Avatar
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    Well, I ordered the Proform from Summit. Fedex says they delivered it today, but I can't find it anywhere! Bastards! I live out in the country so I can't believe anyone drove in here and stole it before I got home.
    Malcolm

    75 Spectra 18
    77 Spectra 19 project

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