What carb and distributor for 289?

69roadrunner · 12-24-2001, 12:23 PM

My neighbor has a 10.5 to 1, .060 over 289 in his '65 coupe. It has C.I aftermarket heads, 284 hyd. cam, F.M. Hi-rise dual plane intake with carb spacer topped off with a 650 v.s. Speed Demon carb.

No matter what I do to the carb, It is still very rich. My Mopar friends have the same problems with the Demon. I haven't drilled the thr. plates and I'm not going too. The idle circuit air vents are installed. I talked him into a Holley but I thought I would ask you what you run on a comparable Ford s.b. He shifts at 6800 rpm.

He also runs a recurved Duraspark distributor with Crane HI-6 ignition. Should he pitch the Duraspark or is it durable?

Any and all help is appreciated!

Gearhead999 · 12-24-2001, 05:51 PM

Is it rich all the time?? I would look at power valve. What size jets??

How much vacumn do you have at idle??

If you install Holley or AFB [elderbrock]. I would use a 750 cfm.

I prefer the MSD dist or, many will disagree with me here, the Mallory Unilite. I have never had any problems with either.

Hope I didn't speak to soon!!!

Rev · 12-24-2001, 07:42 PM

My first Mallory Unilite module lasted 18,000 miles. As I was buying my new one at the speed shop, I mentioned it only lasted 18,000 miles. The guy at the counter said "You're lucky, that's more than they usually last".

If I have to do it again, I'll get an MSD with a magnetic pick up.

Rev

69fastback · 12-25-2001, 08:55 AM

I never hear any good things about Demons. I would defenilty get a holley 750. I have a msd distrubitur and it is awesome. It works great.

69roadrunner · 12-25-2001, 11:17 AM

Gearhead999; It has about 10' hg. @ idle. I've got a 6.5 power valve in it. The jetting is 64 and 68.

The car smokes black at idle and i have the idle screws turned out only about a half turn each. It has the four corner idle adjustment. The p.v. isn't contributing as I've used different vacuum gauges and power valves.

As for the jetting, if I go any smaller, I pick up hesitation under load, yet the plugs are still black. I'm running hotter plugs.

Just for the hell of it, I look up the Barry Grant web site. The tell you that your new carb may run rich, and you may have to drill holes in the throttle plates to give it some air. I'm not drilling a new carb. Demon claims this carb outflows a 4150 holley 750. So why do they advertise it as a 650.

I run a Holley 4150 750 race carb on my BB Mopar for max. vol. eff. Sounds a bit large for a 289 (actually 298). I will try it out.

69 Fastback; MSD distributors are a thing of beauty. I use them too.

Gearhead999 · 12-25-2001, 06:07 PM

10 " isn't alot of vacumn. You may not be getting a signal at the power valve. Have you tried advancing the timing?? Where is the intial timing set?? If you try advancing the timing do it with the vacumn gauge hooked up and see if it increases with the timing increase.

I tend to agree with you on not drilling a new carb. I'd have a problem with that too. What size jets are you running??

A little rich is one thing, but black plugs, etc. Does it load up at idle?? Also, do it clean out on the road, or is it still fat. If it is fat it will act lazy and sprew black smoke on accel.

If you can find a vacant road. Have clean new plugs, run it through the gears and at the top of third or so throw it in neutral and kill the ignition. Pull over and check the plugs then. I know it is a little hard to do....but it will tell you how rich/lean you are at max power. You can get in the ballpark with your jetting that way.

Does car have power brakes?? If so do they work, how do they feel??

Talk to you later.

69roadrunner · 12-26-2001, 07:03 PM

Jetting is at 64 and 68. Just as an experiment, I put a power valve plug in it to see if the smoking went away at idle. It didn't.

I'm convinced the Demon is not a street carb. and definitely shouldn't be put on a smallblock. I'll switch carbs and keep you posted.

I have the car set up at about 12 degrees initial and total is 35 degrees at 2500 rpm.

Gearhead999 · 12-26-2001, 09:37 PM

Sounds like the carb is screwed up. Where is the float level??

Anyway, try another carb and see what happens. I like the AFB's. Of course I'm showing my age too. When I was mucho younger, ie 1960's, no one ran a Holley. Everyone ran AFB's. They are easy to tune and adjust. Plus, the power valve can't get blown out.

Think about it!!!

69roadrunner · 12-26-2001, 10:03 PM

I hear ya oldtimer! Can't say I remember the sixties as I was 1 in '70. my dad has Carter's on his Mopars.
I have a 625 carter AVS on one of my 383's;very reliable. I offered to put one of my carters on and he won't because it isn't chrome or polished. Do you see why I work on it and hot him? The Mustang is a real looker though.

Float level is perfect by the way. I will check in with results on new carb.

j's69stang · 12-29-2001, 03:01 PM

i have put an edelbrock and a holley on my 69 with a mild 302 and i can tell a big difference between the 2. The holley flows alot better and runs alot better. The edelbrock just doesnt have as much punch as the holley. i would go with the holley

69roadrunner · 12-29-2001, 04:07 PM

What series, size Holley do you run on your 302? For volumetric efficiency purposes, a 600 cfm unit should be perfect.

12-24-2001, 12:23 PM	#1
69roadrunner Registered Member Join Date: Jul 2001 Location: Tacoma, Wa 98422 Posts: 19	What carb and distributor for 289? My neighbor has a 10.5 to 1, .060 over 289 in his '65 coupe. It has C.I aftermarket heads, 284 hyd. cam, F.M. Hi-rise dual plane intake with carb spacer topped off with a 650 v.s. Speed Demon carb. No matter what I do to the carb, It is still very rich. My Mopar friends have the same problems with the Demon. I haven't drilled the thr. plates and I'm not going too. The idle circuit air vents are installed. I talked him into a Holley but I thought I would ask you what you run on a comparable Ford s.b. He shifts at 6800 rpm. He also runs a recurved Duraspark distributor with Crane HI-6 ignition. Should he pitch the Duraspark or is it durable? Any and all help is appreciated!

12-24-2001, 05:51 PM	#2
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Is it rich all the time?? I would look at power valve. What size jets?? How much vacumn do you have at idle?? If you install Holley or AFB [elderbrock]. I would use a 750 cfm. I prefer the MSD dist or, many will disagree with me here, the Mallory Unilite. I have never had any problems with either. Hope I didn't speak to soon!!! __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic Last edited by Gearhead999; 12-24-2001 at 06:15 PM..

12-24-2001, 07:42 PM	#3
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	My first Mallory Unilite module lasted 18,000 miles. As I was buying my new one at the speed shop, I mentioned it only lasted 18,000 miles. The guy at the counter said "You're lucky, that's more than they usually last". If I have to do it again, I'll get an MSD with a magnetic pick up. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

12-25-2001, 08:55 AM	#4
69fastback IRAQ VET Join Date: Feb 2000 Location: high desert California Posts: 1,480	I never hear any good things about Demons. I would defenilty get a holley 750. I have a msd distrubitur and it is awesome. It works great. __________________ 428 Cobra Jet SOHC 5.4 3V F-150 96 mystic cobra 91 GT

12-25-2001, 06:07 PM	#6
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	10 " isn't alot of vacumn. You may not be getting a signal at the power valve. Have you tried advancing the timing?? Where is the intial timing set?? If you try advancing the timing do it with the vacumn gauge hooked up and see if it increases with the timing increase. I tend to agree with you on not drilling a new carb. I'd have a problem with that too. What size jets are you running?? A little rich is one thing, but black plugs, etc. Does it load up at idle?? Also, do it clean out on the road, or is it still fat. If it is fat it will act lazy and sprew black smoke on accel. If you can find a vacant road. Have clean new plugs, run it through the gears and at the top of third or so throw it in neutral and kill the ignition. Pull over and check the plugs then. I know it is a little hard to do....but it will tell you how rich/lean you are at max power. You can get in the ballpark with your jetting that way. Does car have power brakes?? If so do they work, how do they feel?? Talk to you later. __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

12-25-2001, 11:17 AM	#5
69roadrunner Registered Member Join Date: Jul 2001 Location: Tacoma, Wa 98422 Posts: 19	Gearhead999; It has about 10' hg. @ idle. I've got a 6.5 power valve in it. The jetting is 64 and 68. The car smokes black at idle and i have the idle screws turned out only about a half turn each. It has the four corner idle adjustment. The p.v. isn't contributing as I've used different vacuum gauges and power valves. As for the jetting, if I go any smaller, I pick up hesitation under load, yet the plugs are still black. I'm running hotter plugs. Just for the hell of it, I look up the Barry Grant web site. The tell you that your new carb may run rich, and you may have to drill holes in the throttle plates to give it some air. I'm not drilling a new carb. Demon claims this carb outflows a 4150 holley 750. So why do they advertise it as a 650. I run a Holley 4150 750 race carb on my BB Mopar for max. vol. eff. Sounds a bit large for a 289 (actually 298). I will try it out. 69 Fastback; MSD distributors are a thing of beauty. I use them too.

12-26-2001, 07:03 PM	#7
69roadrunner Registered Member Join Date: Jul 2001 Location: Tacoma, Wa 98422 Posts: 19	Jetting is at 64 and 68. Just as an experiment, I put a power valve plug in it to see if the smoking went away at idle. It didn't. I'm convinced the Demon is not a street carb. and definitely shouldn't be put on a smallblock. I'll switch carbs and keep you posted. I have the car set up at about 12 degrees initial and total is 35 degrees at 2500 rpm.

12-26-2001, 09:37 PM	#8
Gearhead999 Registered Member Join Date: Sep 1998 Location: Oviedo, FL Posts: 992	Sounds like the carb is screwed up. Where is the float level?? Anyway, try another carb and see what happens. I like the AFB's. Of course I'm showing my age too. When I was mucho younger, ie 1960's, no one ran a Holley. Everyone ran AFB's. They are easy to tune and adjust. Plus, the power valve can't get blown out. Think about it!!! __________________ "Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic

12-26-2001, 10:03 PM	#9
69roadrunner Registered Member Join Date: Jul 2001 Location: Tacoma, Wa 98422 Posts: 19	I hear ya oldtimer! Can't say I remember the sixties as I was 1 in '70. my dad has Carter's on his Mopars. I have a 625 carter AVS on one of my 383's;very reliable. I offered to put one of my carters on and he won't because it isn't chrome or polished. Do you see why I work on it and hot him? The Mustang is a real looker though. Float level is perfect by the way. I will check in with results on new carb.

12-29-2001, 03:01 PM	#10
j's69stang Registered Member Join Date: Apr 2000 Posts: 102	i have put an edelbrock and a holley on my 69 with a mild 302 and i can tell a big difference between the 2. The holley flows alot better and runs alot better. The edelbrock just doesnt have as much punch as the holley. i would go with the holley

12-29-2001, 04:07 PM	#11
69roadrunner Registered Member Join Date: Jul 2001 Location: Tacoma, Wa 98422 Posts: 19	paging j's69stang What series, size Holley do you run on your 302? For volumetric efficiency purposes, a 600 cfm unit should be perfect.