Replacing a DZ carburator - Team Camaro Tech
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post #1 of 6 (permalink) Old Jul 15th, 03, 05:43 AM Thread Starter
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I have 69 Z/28 camaro with all the original parts ,heads intake camshaft etc.The problem is the carburator DZ holley 780 it needs a tune up or a rebuild.What kind of replacement (holley) carb do you recomend me to buy from my local speedshop??Thanks for your help.
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post #2 of 6 (permalink) Old Jul 15th, 03, 06:28 AM
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I had the same problem with my original DZ carb. I rebuilt it, but accidently stripped the threads for the float adjustment on the primary fuel bowl. I didn't feel like spending $60 for a new fuel bowl plus I had a brand new carb sitting in the garage.

I basically moth balled the DZ carb and put on a brand new Holley 650 mechanical secondaries double pumper. It ended up working great out of the box. If you're looking for something that's better on gas mileage, I think the consensus will say that you should stick with a vacuum secondaries carb.

If you're carb isn't in too bad of shape, you should be able to rebuild it yourself for much less than the cost of a new carb. It's not too difficult to rebuild one and it might be worth a try. Just some food for thought.

If you're looking for something more original, brand new carbs, exactly like the original DZ, are available, but they were around $500 to $600 the last time I checked, which is pretty darn expensive in my opinion.

Basically you have a few options to choose from. As far as carb size, your original carb is a 780 cfm, but I think a 650 will be sufficient, if you want to buy another carb. I've run mine, with the 650, up to nearly 7,000 rpm with no fuel starvation what so ever.

Would mine run better with a larger carb? Maybe in the quarter mile, but for street driving, the 650 should give better throttle response.

Good luck, let us know what you decide!

Marty Lake
1969 Z/28 fathom green X77
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post #3 of 6 (permalink) Old Jul 15th, 03, 08:19 AM
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You can send it to the Holley Custom Shop. They will rebuild and re-color it. It will look and run like new, and be original. Not real cheap, but less than a replacement DZ.

'67 SS/RS (RR)
'68 RS conv. (J2)
'68 Z/28 (VV)
'68 Drag Car(ZZ) 11.30 @ 118
'73 Corvette Drag Car 12.64 @ 106

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post #4 of 6 (permalink) Old Jul 15th, 03, 08:27 AM
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The original 780 is basicaly a 3310 with an added secondary power valve. You can not add it yourself as far as I know but the 3310 is set up not to need the extra secondary power valve by richening up the secondary meetering plate.
A 3310 would make a decent inexpensive replacement IMHO.

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post #5 of 6 (permalink) Old Jul 16th, 03, 08:48 PM Thread Starter
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Thanks for your help, I think the 650 is right for me and my wallet.I am only using the car on the street not on the quarter mile.
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post #6 of 6 (permalink) Old Jul 20th, 03, 12:16 PM
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If you have the original DZ carb, get it professionally rebuilt (Jerry MacNeish,; it's a nice piece, and is both rare and valuable. Here's the kind of work Jerry does (my DZ carb):


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