zz502 - 830 annular? - Chevelle Tech
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post #1 of 21 (permalink) Old Apr 26th, 19, 1:49 PM Thread Starter
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zz502 - 830 annular?

Just wanting some opinions on using a Holley 830 annular on my mostly stock ZZ502 with stock cam. Currently I have an 850 (4781-2), and that carb runs well but thinking the 830 may have better mid-range. I've never owned and annular discharge carb, but have heard response is excellent. I don't race the car often, mostly street driven.

Thanks

1972 Monte Carlo 454 (W code), now with ZZ502.
TH400, 2000 stall, 3.31s
11.9 @ 114
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post #2 of 21 (permalink) Old Apr 26th, 19, 1:52 PM
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Re: zz502 - 830 annular?

Personally,I have never used one, but I know a few people that have and I have driven a few cars with one.They work great is all I can say.


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post #3 of 21 (permalink) Old Apr 26th, 19, 2:26 PM
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Re: zz502 - 830 annular?

Quote:
Originally Posted by 72FourFiftyFour View Post
Just wanting some opinions on using a Holley 830 annular on my mostly stock ZZ502 with stock cam. Currently I have an 850 (4781-2), and that carb runs well but thinking the 830 may have better mid-range. I've never owned and annular discharge carb, but have heard response is excellent. I don't race the car often, mostly street driven.

Thanks
After using the 830 A/D carb I would stay with the 4781. The best A/D booster carbs I have used that run great are the BG Mighty series ones. My 850 runs clean and goes great, some have good luck with the QF ones also.
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post #4 of 21 (permalink) Old Apr 26th, 19, 2:58 PM
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Re: zz502 - 830 annular?

I was running an 850 annular mighty demon on my 489 before. That thing worked amazing. Never had an issue with it, but decided I wanted to try fuel injection... can never leave the car alone.
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post #5 of 21 (permalink) Old Apr 26th, 19, 4:43 PM Thread Starter
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Re: zz502 - 830 annular?

The second question I have: the 830 I'm considering has holes in the throttle blades. This would have to be an owner-mod, correct?

1972 Monte Carlo 454 (W code), now with ZZ502.
TH400, 2000 stall, 3.31s
11.9 @ 114
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post #6 of 21 (permalink) Old Apr 26th, 19, 4:56 PM
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Re: zz502 - 830 annular?

Why do you want to choke it with that small carb? I would think 950 minimum.
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post #7 of 21 (permalink) Old Apr 26th, 19, 5:22 PM Thread Starter
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Re: zz502 - 830 annular?

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Originally Posted by va454ss View Post
Why do you want to choke it with that small carb? I would think 950 minimum.
It should actually flow a real 830 cfm from what I gathered. I know Holley changed their flow ratings and so a 950 can actually have smaller venturi than the old 850.

1972 Monte Carlo 454 (W code), now with ZZ502.
TH400, 2000 stall, 3.31s
11.9 @ 114
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post #8 of 21 (permalink) Old Apr 26th, 19, 6:01 PM
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Re: zz502 - 830 annular?

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Originally Posted by 72FourFiftyFour View Post
The second question I have: the 830 I'm considering has holes in the throttle blades. This would have to be an owner-mod, correct?
Yes, it most likely has been drilled by someone. I have the 830 and mine is not drilled. You know that if your 850 is a 4781-1 or higher number you can swap the baseplate with the 830 as long as your 850 was a 4 corner idle, that way you would have a true 850. I did that on my old List 4788 830 non-annular carb and it worked great. I have a 1000hp Holley that has the holes drilled in from Holley but that one did not run well on my Peanut Port engine, just too much for the little heads.
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post #9 of 21 (permalink) Old Apr 26th, 19, 7:35 PM
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Re: zz502 - 830 annular?

Have a look at a quick fuel 1050 annular as well. The 830 with annular does not flow 830, that number is based on downleg boosters.
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post #10 of 21 (permalink) Old Apr 28th, 19, 12:59 PM
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Re: zz502 - 830 annular?

I ran the BG 830 annular on the 469" motor (it was their version of the Holley 950HP) with slightly larger venturi. It was rated a true 830 CFM as I recall. Great running carb. Mine seemed to run fat on the top end, an indication that it was pulling a vacuum on the top end. We attributed it to tendencies of annular carb to do that. Sold it and went to a 4781 when I dropped in the 540". After the fact, we figured out and finally accepted that trying to achieve a certain AFR at WOT was a mistake and should've just jetted for MPH.

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post #11 of 21 (permalink) Old Apr 28th, 19, 8:30 PM
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Re: zz502 - 830 annular?

Will be testing an 830 A/D Holley Monday along with a Holley HP 1000 A/D carb. While I am not able to tell the hp numbers I will be able to tell you which one worked the best on a BBC.
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post #12 of 21 (permalink) Old Apr 29th, 19, 8:59 AM Thread Starter
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Re: zz502 - 830 annular?

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Originally Posted by 68Chevele View Post
Will be testing an 830 A/D Holley Monday along with a Holley HP 1000 A/D carb. While I am not able to tell the hp numbers I will be able to tell you which one worked the best on a BBC.
I'm interested to hear the results and the engine specs. Thanks

1972 Monte Carlo 454 (W code), now with ZZ502.
TH400, 2000 stall, 3.31s
11.9 @ 114
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post #13 of 21 (permalink) Old Apr 29th, 19, 11:59 AM
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Re: zz502 - 830 annular?

People drill the throttle blades because they can't get the idle right.If your 850 is setup properly it shouldn't need to be drilled.I'm surprised that Holley makes any carb with the drilled blades.I had a built ZZ502 with ported heads,bigger cam and a little more compression.It ran great with an 850 and picked up nothing with a QF 1000 on the dyno.That motor never made the power that it should have with the extra mods and that could have been the reason the bigger carb did not make more power.I have heard of a lot of people with an 850 on a 502 that ran great.


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post #14 of 21 (permalink) Old Apr 29th, 19, 9:22 PM
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Re: zz502 - 830 annular?

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Originally Posted by 72FourFiftyFour View Post
I'm interested to hear the results and the engine specs. Thanks
Here is the results I was told I can share. The engine is a 505 BBC with Pro 1 heads, that all I know about it but with an 1150 Dominator and single plane intake the last time it was on the dyno it made over 860hp.

The first test was the 830 A/D Holley and it made the best of 690hp but it ran out of stream at 5800rpm so there was no more testing with it. The second Holley he tested was the 1000hp A/D carb and after jetting the 505 made 788.6hp and 758tq. with 38 timing.
Now mind you this may seem like the engine lost a lot from the Dominator but this is the kicker, the 788hp was with a Sq. Port stock RPM Perfomer non-air gap intake. Even the dyno operator said with some more tuning with the 1000hp it would go over 800hp but the goal was to make less to keep his car from going under 10.0's so I think he needs to change something else. The 1000 was still lean at 788hp and was at 14 to 1 but he stooped the changed to the QF carb, it did not work very well from the start so we ended the day there. Pretty stout for a street intake in my opinion.
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post #15 of 21 (permalink) Old Apr 30th, 19, 6:09 AM
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Re: zz502 - 830 annular?

Carb may well need the t/blades drilled. Large cubic engines, cams with more duration/overlap can both require more idle air. Hence drilled blades. Many production carbs have drilled blades; some provide air [ bypass air ] by other means.
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