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Thread: Jet Size starting point

  1. #1
    Senior Member MASTER BUILDER
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    Jet Size starting point

    Could someone please give me a starting point on which jet's to use with a 850cfm on a 468 big block.

  2. #2
    Senior Member SENIOR BUILDER
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    Is the carb new? If so, start with what it came with. If not, look up the specs for it and compare to what it has in it. To get a better idea of what it might need you need to give a lot more info on your combo, intended use, etc.
    Mark Goulette
    Owner/Driver of the Livin' the Dream dragster
    www.livinthedreamracing.com
    Speed kills, but it's better than going slow!!!!

  3. #3
    Senior Member MASTER BUILDER
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    It is not a new carb. It is a BG that came on a big block running nitrous. I just want to get it in the ball park

  4. #4
    Senior Member RACING JUNKIE mopar1968's Avatar
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    Start with 80's on all corners and work from there. If the power valves are blocked then step up 2 sizes larger then go from there :!: :!: 80's are stock in a 850 holley :!: :!:

    Mark
    Head's up the true drag race!!

  5. #5
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    80 with PV's, 88's with the PV's plugged will be a safer starting point. Put .026 restrictors in the main air bleeds. Once you get it running and get jetting close there are some emulsion changes you can make that will help, but to start this will get you running.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  6. #6
    Senior Member MASTER BUILDER
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    Thanks for the help.


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