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Re: Holley carb won't idle. NEED HELP!
[Re: Quicktree]
#199839
01/21/09 01:00 PM
01/21/09 01:00 PM
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Joined: Jan 2003
Posts: 244
Crowley,TX
70Duster360
OP
super street
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OP
super street
Joined: Jan 2003
Posts: 244
Crowley,TX
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Mr PBODY, all passages were clear.
Quicktree, Initial is at 18 and total is 34. Zero on balancer was checked after degreeing cam. Known good timing light. Using FBO ignition. Parts store control box for now as the FBO box went kaput after a few miles. No difference between the two noticed. Thanks for the help so far!
By the way it has 69 jets in the front and 74 in the back.
Last edited by 70Duster360; 01/21/09 01:02 PM.
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Re: Holley carb won't idle. NEED HELP!
[Re: 70Duster360]
#199842
01/21/09 01:40 PM
01/21/09 01:40 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Mr PBODY, all passages were clear.
Quicktree, Initial is at 18 and total is 34. Zero on balancer was checked after degreeing cam. Known good timing light. Using FBO ignition. Parts store control box for now as the FBO box went kaput after a few miles. No difference between the two noticed. Thanks for the help so far!
By the way it has 69 jets in the front and 74 in the back.
And your sure you put the metering block gaskets
on in the right direction, if I remember right if
they are on backwards they closed a port off and it
might be the idle port(but I cant remember what it did)
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Re: Holley carb won't idle. NEED HELP!
[Re: aarcuda]
#199843
01/21/09 02:30 PM
01/21/09 02:30 PM
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Joined: Jan 2003
Posts: 244
Crowley,TX
70Duster360
OP
super street
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OP
super street
Joined: Jan 2003
Posts: 244
Crowley,TX
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aarcuda, the throttle plates were set so the idle slots were square but the throttle had to be held open well beyond that for it to run. Also this is now my daily driver(using the Edelbrock), although if I can get everything right I'd love to take it to the track. Mr P BODY, I was sure I put the new gaskets right but with me, anything is poss.  I will recheck that.
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Re: Holley carb won't idle. NEED HELP!
[Re: 70Duster360]
#199844
01/21/09 02:39 PM
01/21/09 02:39 PM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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you need to check you manifold vacuum..and adjust your power valve ..
you are probably not generating enough vacuum...that is why you have to open up the throttle blades to get it to run...
your idle mixture screws probably have no effect on the idle????
usuing the fix is to open up the secondary throttle blades a little to help air flow or drill the primary throttle blades...
as noted about a 750 double pumper with 4 corner idle would go along way to getting to idle right...
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Holley carb won't idle. NEED HELP!
[Re: Lil Demon]
#199846
01/21/09 03:13 PM
01/21/09 03:13 PM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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i see where you said the holley was used?
do you know the history of this carb?
nothing worst then trying to fix a bad carb...
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Holley carb won't idle. NEED HELP!
[Re: MR_P_BODY]
#199847
01/21/09 03:38 PM
01/21/09 03:38 PM
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Joined: Jun 2004
Posts: 1,217
Wellington, FL
cudabunch
pro stock
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pro stock
Joined: Jun 2004
Posts: 1,217
Wellington, FL
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Quote:
Quote:
Mr PBODY, all passages were clear.
Quicktree, Initial is at 18 and total is 34. Zero on balancer was checked after degreeing cam. Known good timing light. Using FBO ignition. Parts store control box for now as the FBO box went kaput after a few miles. No difference between the two noticed. Thanks for the help so far!
By the way it has 69 jets in the front and 74 in the back.
And your sure you put the metering block gaskets
on in the right direction, if I remember right if
they are on backwards they closed a port off and it
might be the idle port(but I cant remember what it did)
Mr.P is correct as I have made this mistake.Having the gasket the wrong way will not let it idle and this was on a 950 Holley
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Re: Holley carb won't idle. NEED HELP!
[Re: 70Duster360]
#199848
01/21/09 03:42 PM
01/21/09 03:42 PM
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Joined: Jan 2003
Posts: 5,445
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,445
So Cal
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A couple of issues.. 1. Power valve, the 770 AV comes with a #65. If your vacuum is low due to cam timing, most likely will need to drop this down to a #45 or #35. 2. The squirters used in the 770 AV are smaller than those in the 650 AV, we have found that we had to take this up about 3 steps. Also once you get things dialed in closer, most likely you will need to put a liter spring in for the secondaries. Or you may want to consider Qwik Technology adjustable diaphram for the secondaries dial it rite in. Hope that helps... 
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Re: Holley carb won't idle. NEED HELP!
[Re: Blown61]
#199852
01/22/09 02:50 AM
01/22/09 02:50 AM
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Joined: Jan 2003
Posts: 5,445
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,445
So Cal
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Quote:
Quote:
A couple of issues..
1. Power valve, the 770 AV comes with a #65. If your vacuum is low due to cam timing, most likely will need to drop this down to a #45 or #35.
2. The squirters used in the 770 AV are smaller than those in the 650 AV, we have found that we had to take this up about 3 steps.
Also once you get things dialed in closer, most likely you will need to put a liter spring in for the secondaries. Or you may want to consider Qwik Technology adjustable diaphram for the secondaries dial it rite in.
Hope that helps...
Power valve and squirters have nothing to do with idle. Do your self a favor and go to the holley web site, lots of info and pics.
Do you understand the basics for the power valve operation.. 
Power valve tuning considerations require that the power valve should only open at wide open throttle not at idle..
Here the key is to ensure that idle vacuum does not drop below the power valve opening point.
For example..
Eratic, rough idle and over-rich condition is caused by an 8.0 idle vacuum and a power valve rated 10.5 inches of manifold vacuum. Note that a big cam w/overlap can/will drop the idle vacuum down below 8 inches.
Next Holley question please... 
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