Need help with Holley 750 - Page 2

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, 08:44 AM	#11
danny waters sr VIP Member Join Date: Apr 2007 Location: lagrange,nc Posts: 2,224 Likes: 0 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	#12
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 12 Times in 8 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	#13
Jeff Teuton VIP Member Join Date: Jan 2002 Location: Houma, LA Posts: 2,717 Likes: 2 Liked 326 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	#14
Chip THELEGEND Johnson Member Join Date: Jun 2007 Posts: 284 Likes: 223 Liked 280 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	#15
Jeff Teuton VIP Member Join Date: Jan 2002 Location: Houma, LA Posts: 2,717 Likes: 2 Liked 326 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	#16
Chip THELEGEND Johnson Member Join Date: Jun 2007 Posts: 284 Likes: 223 Liked 280 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