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Holley Ultra 950 hp jetting #1245243
06/04/12 12:31 PM
06/04/12 12:31 PM
Joined: Aug 2011
Posts: 188
Middletown, Ohio
J
Joes66dart Offline OP
member
Joes66dart  Offline OP
member
J

Joined: Aug 2011
Posts: 188
Middletown, Ohio
Ok guys i need help on this one. I just put a new motor in my car and am having problems getting jetting correct. The motor is a 440 with stock crank and rods. Trw slugs. I'm running a victor intake and 915 heads with very little port work done. We built the motor as a quench motor and ended up with .040 quench. it has a 590 purple shaft with harland 1.6 rockers so were looking at .629 or so lift. It also has a 1" 4 hole spacer under the carb. Problem is we bolted carb on out of the box. It had 92 jets in it which we figured were going to be to big but we tried it. After about 10 jet changes we ended up at 96 jets. Now we know this is way to much jet for the car but that is what it took to get some color on the plug and the fastest times out of the car. We are thinking we need to change the air bleeds to smaller ones but we have no experience with one of these carbs. If anyone has an idea of where I should start as far as air bleeds and jets I'm all ears. The car was very consistant with the 96 jets but we know that it shouldnt take that much jet to make this motor run.

Re: Holley Ultra 950 hp jetting [Re: Joes66dart] #1245244
06/04/12 01:07 PM
06/04/12 01:07 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Joined: Jun 2003
Posts: 52,972
Romeo MI
Does it have a PV.... dont pay too much attention to
the jet number... if the engine wants the fuel, give
it the fuel... but if it has a PV that could be wrong

Re: Holley Ultra 950 hp jetting [Re: Joes66dart] #1245245
06/04/12 01:19 PM
06/04/12 01:19 PM
Joined: Jan 2003
Posts: 31,043
Oregon
A
AndyF Offline
I Win
AndyF  Offline
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Joined: Jan 2003
Posts: 31,043
Oregon
That carb should work just fine right out of the box. If you're using unleaded gas then you probably won't see any color on the plugs. Get a wide band setup if you really want to know what is going on.

Re: Holley Ultra 950 hp jetting [Re: AndyF] #1245246
06/04/12 02:10 PM
06/04/12 02:10 PM
Joined: Aug 2011
Posts: 188
Middletown, Ohio
J
Joes66dart Offline OP
member
Joes66dart  Offline OP
member
J

Joined: Aug 2011
Posts: 188
Middletown, Ohio
The carb has 6.5 power valves in it. We are running sunoco race fuel so I thought we would see some color. We have discussed wideband O2 just not sure if I want to spend the money yet.

Re: Holley Ultra 950 hp jetting [Re: Joes66dart] #1245247
06/04/12 03:44 PM
06/04/12 03:44 PM
Joined: May 2005
Posts: 1,030
ohio
6
67mprfan Offline
super stock
67mprfan  Offline
super stock
6

Joined: May 2005
Posts: 1,030
ohio
I thought the same thing on my 1050 but seems to like the combo i have in it 95-97 no pv

7235963-63250004.jpg (76 downloads)

71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's
Re: Holley Ultra 950 hp jetting [Re: 67mprfan] #1245248
06/04/12 05:10 PM
06/04/12 05:10 PM
Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
roadhazard Offline
master
roadhazard  Offline
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Joined: Apr 2006
Posts: 3,675
Akron, Ohio U.S.A.
A 6.5 PV with a .590 cam?

Can't say I've ever worked with the vaunted .590 but I'd think you would want to block the secondary PV and try a 3.5 in the front
But that's just me licking my finger and sticking it in the air for a garage tune

What are your vacuume readings @ idle







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