Holley 830 cfm w/annular boosters - Chevelle Tech
Performance Our High Performance area

 45Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 55 (permalink) Old Aug 9th, 19, 8:31 AM Thread Starter
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 13,996
Holley 830 cfm w/annular boosters

Folks, methinks the scuttlebutt on these is to steer clear, due to the annular boosters going lean at rpm. New engine wont be the same RPM monster the 427 was, wondering if this setup is acceptible to 6000 rpm. 467 c.i.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
Sponsored Links
Advertisement
 
post #2 of 55 (permalink) Old Aug 9th, 19, 9:50 AM
Senior Tech Team
 
Join Date: Mar 2004
Location: Shippensburg, PA
Posts: 4,659
Re: Holley 830 cfm w/annular boosters

What happened to the Q-jet plan? Booooo!

J/K.... for a 6000 rpm street engine (assuming a q-jet is not in the cards), I'd just find a nice early 3310 core and call it a day.

I still think a sneaky L34 look would be way cool (and I love my q-jets).
novadude is offline  
post #3 of 55 (permalink) Old Aug 9th, 19, 10:49 AM
Lifetime Premium Member
Guy
 
Join Date: Dec 2006
Location: Nova Scotia Canada
Posts: 2,366
Garage
Re: Holley 830 cfm w/annular boosters

Gene,I have a 825 Mighty Demon with annular boosters that's been on my big block 468 and now 513 for quite a few years.
I have never encountered any lean conditions.
It flat out works awesome !!!
Guy
427L88 likes this.

'86 Monte SS,
513 Stroker,
AFR CNC'd 315 heads,
Custom Bullet solid roller,.706, 285/293-255/263 @ .050,110 LSA,UDHarold's lobes.
Isky .904 EZX Roll lifters,
Thanks to Mike "Wolfplace" Lewis,
Weiand Stealth intake,ported & gasket matched,
825 Mighty Demon,tuned by jmarkaudio,
2 inch Hooker Headers,(Coated),
Doug Nash 4+1 5 speed,w/a couple of cryo treated gears,
9 inch rearend,
Hurst Vertical Gate II In Line Shifter,
TC Member # 4921
GuysMonteSS is online now  
 
post #4 of 55 (permalink) Old Aug 9th, 19, 2:47 PM
Lifetime Premium Member
Jason
 
Join Date: Sep 1998
Location: Highland Village TX, USA
Posts: 3,088
Re: Holley 830 cfm w/annular boosters

Annular boosters themselves don’t cause a high RPM lean condition. I shift at 8000-8200 RPM with annular boosters and plan to shift at 9000 RPM on my next iteration of overgrown SBC (1000+ HP target goal)

If that were the case annular boosters wouldn’t be used in 4500 dominator series carbs.

It may be that the stock 830 calibration needs a HSAB change.
427L88 and GuysMonteSS like this.

Jason Gore
AKA DragRacer
Naturally Aspriated 450 SBC - 915 HP / 714 lb-ft
3370 lbs
1.36 - 60', 5.93 @ 116.7 MPH - 1/8th
DragRacer is offline  
post #5 of 55 (permalink) Old Aug 9th, 19, 6:23 PM
Senior Tech Team
 
Join Date: Dec 2005
Location: Lancaster, PA
Posts: 10,869
Re: Holley 830 cfm w/annular boosters

Quote:
Originally Posted by DragRacer View Post
Annular boosters themselves don’t cause a high RPM lean condition. I shift at 8000-8200 RPM with annular boosters and plan to shift at 9000 RPM on my next iteration of overgrown SBC (1000+ HP target goal)

If that were the case annular boosters wouldn’t be used in 4500 dominator series carbs.

It may be that the stock 830 calibration needs a HSAB change.
I think like Jason said, the early 4150 carburetors with annular boosters sometimes encountered those types of problems and they couldn’t be tuned out due to the non adjustable nature of them. Later on as air bleed changes and mods became standard they started to gain a following. I was one back almost 15 years ago that had a demon carb that would not come off the transbrake clean and had issues on the dyno. 2 old downleg 850 carbs ran cleaner than the demon did with annulars. It wound up being sent back to Barry grant to be converted to downleg.
427L88 likes this.

Ray


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Best pass 8.87 at 150.98 1.212 60'. Sold 3/2018

1970 SS 396 project in progress. Bought 5/2018
bracketchev1221 is offline  
post #6 of 55 (permalink) Old Aug 9th, 19, 6:45 PM
Tech Team
 
Join Date: Feb 2019
Posts: 256
Re: Holley 830 cfm w/annular boosters

Here is the problem with the line of A/D booster carbs from Holley, the boosters are junk and that's not from me that is what BLP told me. They said the problem is the hole pattern in the booster is pretty poor on them, BLP has new Booster inserts that are really easy to install and fixes the lean problems. Always wondered why they sold a 12 hole booster and Holley uses 6. Both of my Holley A/D carbs were lean on the dyno no matter where we jetted them but the same type carb with a down leg booster was spot on. The 1000hp was at 14.3 to one even with a ton of jet, even changing bleeds make it fatter at the top end and really pig rich at the bottom. I have 2 Demon's with A/D boosters went up 4 jet sizes and were dead on at 12.8 to 1
427L88 likes this.
68Chevele is offline  
post #7 of 55 (permalink) Old Aug 10th, 19, 2:48 AM
Tech Team
Kerry
 
Join Date: Feb 2013
Location: Lloydminster, Alberta
Posts: 816
I would be confirming it doesn’t have a common too much emulsion issue. There should only be 2 open emulsion per side of each metering block.
pockets is offline  
post #8 of 55 (permalink) Old Aug 10th, 19, 8:14 AM Thread Starter
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 13,996
Re: Holley 830 cfm w/annular boosters

Dont fret novadude, a Qjet will be used for most "OTR" duty, but the Holley ought make more power for ET. I have an old 850DP that's fresh and ready to go, even thought about pulling the boosters in it and putting aftermarket in, if only to modernize the old beast. Or pick up an annual carb direct from Holley refurb'd. Looking to really bolster the throttle response, so it feels like a blower car.

68 Chevelle, I suspect this is the issue that the engine builder saw on the dyno and doesnt prefer them for that reason.


Curious to see how much the Qjet loses over the Holley on this engine. Hope to find out on Tuesday when Mark runs the dyno test! All I know is that the heads are flowing really, really well at mid lift, so it should put down the power. How much the Qjet loses will be the question.

And yes, it will look "similar" to a 325hp 396. I cant use that stupid restrictive air cleaner however. Therefore I'll dress it down as a 350hp/396 w/ painted intake ( being that its a modern GMPP).

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
post #9 of 55 (permalink) Old Aug 10th, 19, 8:22 AM
Senior Tech Team
Chris
 
Join Date: Feb 2006
Location: Lincoln pk NJ
Posts: 3,370
Re: Holley 830 cfm w/annular boosters

Gene, does the 850 have down leg boosters in it?

The QF850 I ran on my 406 had them and worked fine.
Were/are you having issues with it?

Just curious.

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
WHT/73 is offline  
post #10 of 55 (permalink) Old Aug 10th, 19, 8:24 AM Thread Starter
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 13,996
Re: Holley 830 cfm w/annular boosters

Yes, and no issues at all when it was run prior to the tripower install over 10 years ago. Just looking to optimize everything is all. I may even stake new aftermarket boosters in for next year in lieu of buying refurb from Holley, so wanted to hear others experiences of A/D vs downleg.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
post #11 of 55 (permalink) Old Aug 10th, 19, 9:25 AM
Tech Team
Kerry
 
Join Date: Feb 2013
Location: Lloydminster, Alberta
Posts: 816
The quick fuel 1050 with annular boosters is a good carb also. Stay away from the new holley XP carbs. Poor body design which has distribution problems.
Look at the venturi and throttle bore sizes when comparing carbs, if you didn’t know that already.
427L88 likes this.
pockets is offline  
post #12 of 55 (permalink) Old Aug 10th, 19, 9:29 AM
Senior Tech Team
Bob
 
Join Date: Aug 2002
Location: Pa
Posts: 1,296
2 Q jets!!!! Go big or go home
427L88 likes this.
1968 hot rod is offline  
post #13 of 55 (permalink) Old Aug 10th, 19, 4:09 PM
Lifetime Premium Member
Darren
 
Join Date: Oct 2000
Location: Indianapolis IN
Posts: 3,172
Re: Holley 830 cfm w/annular boosters

Gene, a little off topic, but which one of Marks engines did you decide on? Looking back in past posts, can't find that info. What's the specs?

Darren
1971 Chevelle
496
CFM Ported Stage 5 Brodix Race-Rites 310cc
10.5 scr
Ultradyne Solid Roller 256/264 .660/.660 108 lsa
CFM Ported Victor Jr / Pro Systems Venom VX 1050
T-56 Magnum 6 Speed, DFX
12 Bolt TrueTrac, 4.56 gear 33 spline Moser axles
30x12.5 ET Street Radial
525++ rwhp
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
71454Chevelle is offline  
post #14 of 55 (permalink) Old Aug 11th, 19, 5:23 PM Thread Starter
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 13,996
Re: Holley 830 cfm w/annular boosters

Darren, a 467 with full head work and a hyd roller. GMPP dual flange mani so I can pop a Qjet on there for long road trips, as the old 850DP is a ravenous pig. I had ^almost^ thought of staking new boosters in when I went thru the carb recently ,as so many carb gurus preach on A/D boosters, but let it alone, as it ran fine before.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
post #15 of 55 (permalink) Old Aug 11th, 19, 10:22 PM
Team Member
Bob
 
Join Date: Nov 2007
Location: Gainesville/ERA, TX
Posts: 485
Send a message via AIM to 540 Olds
Re: Holley 830 cfm w/annular boosters

What are you gonna do if Q-jet makes equal or more..?? I think they'll support 600hp range; maybe more.

Bob
77 cruiser likes this.
540 Olds is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome