carburator question
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carburator question

  1. #1

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    Default carburator question

    my carb got stolen. was a 750 dp holley.could i use a 750 vac. sec. holley on a jet boat.350 chev jacuzzi yj.

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    21 Daytona Outlaw's Avatar
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    my old marine power 502 had a vac sec.

  4. #3

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    and it worked well? my neibor said never use a vac sec carb on a jet boat. so hes full of s**t?

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  6. #4
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    Quote Originally Posted by boatdude22 View Post
    and it worked well? my neibor said never use a vac sec carb on a jet boat. so hes full of s**t?
    He's not full of it, as it will work fine.
    Is it base case......Hell no!!
    A single carb can be bad enough with cyl to cyl fuel distribution (especialy part throttle cruising), let alone a vac sec, they make a real mess!!

  7. #5
    mo balls than $cents$ IMPATIENT 1's Avatar
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    seen to many detonation damaged pistons to ever run a vaccum secondary on anything i own

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    could i jet it up, new power valve to stop that?

  9. #7
    Senior Member koyota93's Avatar
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    I have run a 3310 750 Holley vac secondary on my 454 BBC. My buddy gave me his 750 DP, but I could never get it to idle right. Neither could he because he replaced it with a Demon. My vac second. has been running flawless, so I don't have really any good reason to take it off. Plus I just rebuilt it too. I am not expert, but I think you should be fine running a vac sec on your 350.

  10. #8
    Senior Member LuckyDaze's Avatar
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    I stay away from vacuum secondaries because they are 1, bad on gas mileage, 2 I like to control the throttle position of my boat, 3 distribution issues. Many people use them with good results though so its all personal decision I suppose.

    ~Brian

  11. #9

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    thanks for all the info guys.im a pretty good carb guy,but never tried a vac.sec. on a jet boat.what jets and power valve would you suggest as a baseline? 350 chev 11:1 compression, 488I 510E 300i 310E 110LC CAM,B impeller 1400lb boat. thanks scott

  12. #10
    21 Daytona Outlaw's Avatar
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    Quote Originally Posted by LuckyDaze View Post
    I stay away from vacuum secondaries because they are 1, bad on gas mileage,

    ~Brian


    WHAT??

  13. #11

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    What-what???

  14. #12

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    SINGLE PLANE TEAM g, STRAIGHT BOOSTERS already have blue cam 78 sec. jets no power valve???

  15. #13
    Senior Member Widetrack's Avatar
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    The only time I tried to run one. The secondarys would try to open up just at plane then you would try to back off and the boat would come down from cruise and off plane! It would run good at WOT. Just didn't like the surging when secondarys opened!

  16. #14
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by Widetrack View Post
    ...Just didn't like the surging when secondarys opened!
    That's because you didn't have the right springs.
    715 vac Holley on my 468 Cheby to 5200 RPM's...works great, I need nothing bigger w/better fuel economy vs a double pumper.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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