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Old 06-19-2004, 07:53 PM
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Holley Rebuild

I have a Holley 750 that needs rebuilding. I have gas going into the crank case. The previous owner change the jets. (I don't know what else) The question is, If I buy a rebuild kit will it have enough info in the kit for me to rebuild it? What else do you think he may have changed with the jets? I have rebuilt dirt bike and boat carbs but I have never worked on a holley. I check and they want $200 to rebuild it.
Carb is 4779-3 holley on 400 sbc
Thanks for any help. Randy
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Old 06-19-2004, 08:08 PM
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Holley carbs are very easy to rebuild. You will probably have to buy jets along with the kit, as they are not usually included. It is also better to buy the genuine Holley kits as the gaskets and power valves are better. A Holley Trick Kit has adjustability.

The secret to a good rebuild is making sure all gasket surfaces are clean and straight. The correct gasket is used (most kits have several different). Blow out all air bleeds and orfices with air. Set the float ans acc. pump correctly and match the power valve to your application.

If you are using this carb on a street machine with an automatic trans and mild rear gearing, it will always run rich and load up. A vac secondary carb is better under those conditions. A ball park figure is around 70 jets primary. 72-74 secondary. 55-65 power valve.
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Old 06-19-2004, 08:14 PM
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thanks for the help BOBCRMAN@aol.com.
The carb is going to be run on the street with turbo 350 trans and 373 gear. I was going to try to go with 70 primary 73 secondary on jets but I had no idea on power valve. Thanks
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Old 06-20-2004, 07:15 AM
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I have the same set-up 406sb/3.73 gears/TH-350 and I was also told that a 750 vac. sec. is probably best for automatic trans. with a 400sb. Try a 4-hole spacer with that if its a little over-carbed.
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Old 06-20-2004, 08:03 AM
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Sorry for all the trouble but could someone tell me how to set floats?What the floats set on? Does the front set different from the back?? Thanks for the help.
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Old 06-20-2004, 08:11 AM
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Buy some assorted jets and play with them until you get what you want.

I run a 355-700r4-373s, with a 780 DZ holly 62s and 68s, 65 pv.

Set the floats so that the gas in the bowl is at the bottom of the sight plugs. Instructions are in the kit.

Troy
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Old 06-20-2004, 08:12 AM
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Detailed instructions are in the kit. The floats contact the inlet needle and seat (fuel inlet valve). Correctly set, the operating fuel level will be at the bottom of the sight plug holes(brass plugs with slots) in the side of the bowls.
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Old 06-20-2004, 08:17 AM
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Is it a rule of thumb to set the front fuel bowl a little higher then the back bowl? I dunno
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Old 06-20-2004, 08:18 AM
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Bob, are you really at Holly mi.? working on hollies?

Both floats should set the same.

Troy
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Old 06-20-2004, 08:23 AM
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Thank you Troy
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Old 06-20-2004, 01:33 PM
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Troy-Curt.. YUP! Holleys in Holly.
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Old 06-23-2004, 02:23 PM
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I bought the Haynes Holley Carb Rebuild book for $15 at Auto Zone. I haven't had the chance to open my 600 up and play around with it, but between the book and this thread, I don't think I'll have a problem.

Thanks for the info guys.

Oh and Bob, I really do recommend the book. It's definitely got you covered.





MoocH
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