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Thread: Hilborn Shot Gun Injected 468 Big Block Chevy Setup

  1. #1

    Hilborn Shot Gun Injected 468 Big Block Chevy Setup

    I have a 468 Big Block Chevy Im seting it up with a Hilborn Shotgun hat injector 80A Pump I need to no what Nozzles To start with I plan on puting a high speed bypas also it is in a Altered Bantum with a B&J 3 speed Hays two disk clutch & 456 gearsI also need to no where to start with a barrel valve leek down & pill size & timing im at 4400 feet

  2. #2
    Junior Member SHOW GUEST
    Join Date
    Jun 2015
    You didn't state what fuel you are using, and didn't complete the pump information, as 80A-0 -.5 or -1. Make a big difference. Call or Email Hilborn, and they will give you a ball park starting point, just convert your Enderle pump size to Hilborn pump size. They will give you a "on the rich" side cal, because they really don't know the exact flow rate of your pump, just a ball park figure. My guess would be 9A nozzles for gas, or 20A nozzles for Alcohol. Don't know what barrel valve you have, gas alky or nitro, I use a nitro barrel valve on alcohol with a injected motor, with 18% to 22% leakdown. If gas is the fuel then 9% to 10% leakdown. the return pill size depends on the pump size. Don't worry about a high speed by-pass until you get the basic fuel cal worked out, then you will richen it up a little and work with a high speed by-pass. Since your system wasn't tuned on a flow bench, your will be spending a lot of track time tuning it. I have put a pressure gauge in the system and found out what pressure was at around 6500 to 6800 rpm's then set up a high speed for that pressure with the main jet richened for the high speed install to the system. Just make sure you keep a eye on your oil for fuel contamination. If I remember right on a Big Block Chevy, Number 2 cylinder is the one that has a tendency to run lean. Jerry

  3. #3
    Senior Member RACING JUNKIE oldandtired's Avatar
    Join Date
    Dec 2008
    Sugar Hill, GA
    Mike Chilando has helped me with my stack ingection set up.
    "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke

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