Need help with Holley 750

Chris1529 · 09-17-2007, 07:05 AM

The idle air bleeds won't cause it to hesitate, it would just sound like a V-6 at idle if they are dirty.
I'd say to go up on the squirters.

Is that the Texas two step you are talking about Myron? If Chip is a little lean doing that, maybe someone should have took him a couple beers! No wonder it took till 300 am to finish that race Saturday!

Chip THELEGEND Johnson · 09-17-2007, 07:47 AM

I'm footbraking between 2000 & 2500 rpm's depending on track.
The air saturday was similar to the first 2 tracks.

It is a brand new carb.
Sunday Morning:
We went up on the squirter.
Went up on the timing.
Raised the floats
Adjusted the pump arms.

It did fine the first 3 passes. 3rd rd I dropped rpm to 2200 and it did it again.

HELP ME HELP ME HELP ME.
Chip

danny waters sr · 09-17-2007, 08:44 AM

Chip call me ..../I think i can help...

Michael Beard · 09-17-2007, 10:14 AM

>> It did fine the first 3 passes. 3rd rd I dropped rpm to 2200 and it did it again.

Oh, ok. I didn't get a chance to talk to you after the run. I figured you'd only give me an .022-.024 after being .000, so I was surprised at the .04. I figured maybe the polished rims blinded you.

I have no excuse for mine!

Jeff Teuton · 09-17-2007, 11:33 AM

First make sure all the passages are clean. If you still have the power valve, take it out and plug the hole. Go up 2 or 3 on the jet. That is what made it go away on my Top Stock. Holley 4779

Chip THELEGEND Johnson · 09-17-2007, 02:33 PM

Jeff,
The carb originally had the PV blocked. I like leaving between 2000 and 2400, at those RPMs it had a horrible idle. We put a PV in and rejetted. Carb idles geat now.
Thanks
Chip

Jeff Teuton · 09-17-2007, 03:15 PM

Sounds like your idle passages might be blocked. I had one doing that. Didn't like to idle, but seemed ok @ wot. Quick fuel fixed it at the track. Idle passages were blocked amoung other things. Took a lot. After it was fixed, it made enough difference to bust 2 8/34 gears and 2 pro trans. I assume it is an out-the-box 4779?. Usually a stumble is lack of fuel. Just got to find it. On the T/STK 360 we ran 76 to 78 jets on all 4 corners and no pv. We left on a 2 step, but it would launch almost as well footbraking. No stumble and we ran 7 lbs pressure. Still run 7 lbs.

Chip THELEGEND Johnson · 09-17-2007, 05:50 PM

Jeff after reading your last post. I'm going to check all the passages. It is an out of the box new 4779. We all know the quality of new parts these days.
Thanks
Chip

09-17-2007, 07:05 AM	#1
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	Re: Need help with Holley 750 The idle air bleeds won't cause it to hesitate, it would just sound like a V-6 at idle if they are dirty. I'd say to go up on the squirters. Is that the Texas two step you are talking about Myron? If Chip is a little lean doing that, maybe someone should have took him a couple beers! No wonder it took till 300 am to finish that race Saturday! __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

09-17-2007, 07:47 AM	#2
Chip THELEGEND Johnson Member Join Date: Jun 2007 Posts: 284 Likes: 223 Liked 281 Times in 79 Posts	Re: Need help with Holley 750 I'm footbraking between 2000 & 2500 rpm's depending on track. The air saturday was similar to the first 2 tracks. It is a brand new carb. Sunday Morning: We went up on the squirter. Went up on the timing. Raised the floats Adjusted the pump arms. It did fine the first 3 passes. 3rd rd I dropped rpm to 2200 and it did it again. HELP ME HELP ME HELP ME. Chip

09-17-2007, 08:44 AM	#3
danny waters sr VIP Member Join Date: Apr 2007 Location: lagrange,nc Posts: 2,224 Likes: 1 Liked 0 Times in 0 Posts	Re: Need help with Holley 750 Chip call me ..../I think i can help... __________________ Danny Waters, Sr / 73 Duster "340"

09-17-2007, 10:14 AM	#4
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 13 Times in 9 Posts	Re: Need help with Holley 750 >> It did fine the first 3 passes. 3rd rd I dropped rpm to 2200 and it did it again. Oh, ok. I didn't get a chance to talk to you after the run. I figured you'd only give me an .022-.024 after being .000, so I was surprised at the .04. I figured maybe the polished rims blinded you. I have no excuse for mine! __________________ Michael Beard - NHRA/IHRA 3216 S/SS

09-17-2007, 11:33 AM	#5
Jeff Teuton VIP Member Join Date: Jan 2002 Location: Houma, LA Posts: 2,717 Likes: 2 Liked 325 Times in 50 Posts	Re: Need help with Holley 750 First make sure all the passages are clean. If you still have the power valve, take it out and plug the hole. Go up 2 or 3 on the jet. That is what made it go away on my Top Stock. Holley 4779

09-17-2007, 02:33 PM	#6
Chip THELEGEND Johnson Member Join Date: Jun 2007 Posts: 284 Likes: 223 Liked 281 Times in 79 Posts	Re: Need help with Holley 750 Jeff, The carb originally had the PV blocked. I like leaving between 2000 and 2400, at those RPMs it had a horrible idle. We put a PV in and rejetted. Carb idles geat now. Thanks Chip

09-17-2007, 03:15 PM	#7
Jeff Teuton VIP Member Join Date: Jan 2002 Location: Houma, LA Posts: 2,717 Likes: 2 Liked 325 Times in 50 Posts	Re: Need help with Holley 750 Sounds like your idle passages might be blocked. I had one doing that. Didn't like to idle, but seemed ok @ wot. Quick fuel fixed it at the track. Idle passages were blocked amoung other things. Took a lot. After it was fixed, it made enough difference to bust 2 8/34 gears and 2 pro trans. I assume it is an out-the-box 4779?. Usually a stumble is lack of fuel. Just got to find it. On the T/STK 360 we ran 76 to 78 jets on all 4 corners and no pv. We left on a 2 step, but it would launch almost as well footbraking. No stumble and we ran 7 lbs pressure. Still run 7 lbs.

09-17-2007, 05:50 PM	#8
Chip THELEGEND Johnson Member Join Date: Jun 2007 Posts: 284 Likes: 223 Liked 281 Times in 79 Posts	Re: Need help with Holley 750 Jeff after reading your last post. I'm going to check all the passages. It is an out of the box new 4779. We all know the quality of new parts these days. Thanks Chip

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