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Thread: 4776-7 rebuild questions

  1. #1

    Default 4776-7 rebuild questions

    Just a few questions for the Holley gurus here. Just a little background information of what my setup is. I have got a 4776-7 carb that I bought used last year. The gentleman that I bought it from said he just pulled it from his 327 Chevy and it was running very well. I put it on my 79 Mustang with a swapped 5.0 and T-5 transmission and indeed it did run very well, except for the bog when the secondaries kicked in. I really didn't pay it any mind since I was just playing with the car on the weekends and it wasn't my main ride. Come last October the primary float bowl began leaking so I parked it for the winter. I just bought a 37-485 renew kit and started tearing it down. Found that the previous owner pulled the 73 jets from the secondaries and installed them as the primaries, and left the secondaries wide open. My questions are 1. I swapped the 73's back to the secondary side and installed a spare set of 66 jets in the primary side. Would this have been the reason for the bogging? 2. Would these be a good starting point for when I finally fire the Mustang back up or should I swap the jets before hand. And 3. Is there any tips and tricks I can use to make this a better running carb?
    Thanks. Rob

    P.S. Does anyone happen to know when the 4776-7 was finally released?

  2. #2
    Join Date
    Dec 2009


    Quote Originally Posted by Rob_Lashley View Post
    Found that the previous owner pulled the 73 jets from the secondaries and installed them as the primaries, and left the secondaries wide open.
    Your carburetor has been severely "hacked" on.
    You're doing the right thing by rebuilding it to factory specifications.
    Disregard how it ran before the carburetor rebuild; you'll begin with a fresh start after the rebuild.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
    Join Date
    Jan 2013
    Constantine, MI


    I agree with Danny, the tips and tricks will come later, but I don't think you will need more than a fine tuning.

  4. #4


    So basically start with a baseline and go from there. Thanks for the help. I'll keep everyone updated on how it's running as soon as I get it all back together.

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