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Thread: 950HP Jetting

  1. #1
    Senior Member RACING JUNKIE
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    950HP Jetting

    I have a 950HP and wondered how much I can jet this thing with out messing up the balance of the carb. It's currently running way too lean.

    Front 82
    Rear 84
    Air bleeds 72
    Squirter 31
    Power valves 3.5

    Thanks, Dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

  2. #2
    Senior Member MASTER BUILDER
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    carb

    hey old and tired. front is probbly ok. you say power valveS so i assume one is in the rear, i would remove it and go uo aprox 8 jet sizes. i like idea of power valve in front and i run the exact same setup as you describe for your carb, except mine is about 820 cfms.(750) with hp center section art

  3. #3
    Senior Member RACING JUNKIE
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    Art, Thanks for the info. I have a plug, and 90's & 92's to try.
    Dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

  4. #4
    Senior Member MASTER BUILDER
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    jetting

    let us know how you make out with the jet changes. we all learn from each others experiments. watch out for that size 90 up front. sounds a little large. could load you up driving around i the pits. good luck art

  5. #5
    Senior Member MASTER BUILDER
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    jetting

    let us know how you make out with the jet changes. we all learn from each others experiments. watch out for that size 90 up front. sounds a little large. could load you up driving around i the pits. good luck art

  6. #6
    Senior Member MASTER BUILDER
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    Dave,This is from the build sheet of my pro systems holley hp 950. Primary main 76 [72 to 78] 6.5 power valve.Sec.main 86[83 to 89]power valve pluged.Hi air 36 all 4 low air 76 all 4.Bill.

  7. #7
    Senior Member RACING JUNKIE
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    Multiple errors on the set up. Lots of trial and error (and fuel) and here is what runs best.

    Front 84
    Rear 88
    2.5 power valves (F&R)

    Idles like a champ and the throttle response is crisp. After testing the PV's, I discovered one was actually a 6.5 (unmarked) and I had leaned out everything trying to compensate for this rich condition.

    Thanks to all.
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

  8. #8
    Member CRAFTSMAN
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    Quote Originally Posted by wmeabates
    Dave,This is from the build sheet of my pro systems holley hp 950. Primary main 76 [72 to 78] 6.5 power valve.Sec.main 86[83 to 89]power valve pluged.Hi air 36 all 4 low air 76 all 4.Bill.
    That's identical to the build sheet from my prosystems. If you don't mind me asking what are you running for an engine, they say no off the shelf carbs. I am having to run a spacer as the accerator pump hits an intake runner. Just curios.
    This wouldn't have happened if only you had been paying attention!

  9. #9
    Senior Member MASTER BUILDER
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    Bluedawg,That carb was on a 412 sbc 3200# car.That carb never ran like I thought it should.I tryed it on and off last year with different settings with a best of 9.70@140.71.The last day of the season I put on a new aluminum ultra 850 and went 9.38@144.93.I think the 950 could use adj.emulsion metering blocks for more tuning but Prosystems told me I didn't need it.Looks like just a bunch of holley parts put together with stickers to me. Just my opinion.Sorry for the jack Dave.Bill.

  10. #10
    Member CRAFTSMAN
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    also sory for hijacking the thread. My brother suggested the prosystems and after some research it seemed like a good deal. I havn't put it on yet, hopefull that it works great, but your build sheet matches mine almost identical & I don't think that my 400 is nearly built as much as your 412. well see.
    This wouldn't have happened if only you had been paying attention!


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