66 289w carb question

AMP63 · 12-06-2004, 06:34 PM

[FONT=Arial Black]does anyone know how well a holly 670 street avenger carb works om sb289 w/milled heads,headers comp cam weind stealth intake and what psi should the fuel pump psi be set to?

Rev · 12-06-2004, 09:34 PM

I use a 625 CFM Road Demon on my 306. It seems just about right. I would think that the 670 CFM Holley would be right at the upper limit for your 289. You can get away with a little over size since it has vacuum actuated secondaries. I certainly wouldn't go any bigger on that 289. Set the line pressure to about 7.5-8 psi. That should be plenty and won't over power the needles & seats on the carb.

Rev

AMP63 · 12-06-2004, 09:41 PM

thanks for the info...i heard from local parts store that that 670 holley str/av is more reliable and EASIER to keep tuned....do you think they're right or just telling me that.Iam having so many problems with my 650 d/p i am ready to make fishing weight out of it and its only 6mos old.

KiltedBanshees93GT · 12-07-2004, 09:04 AM

DoublePumpers can be more difficult to tune. Vac secondarys will make your life a lot easier. Tho I would either go for a 600 or 650.

Just my .02
J

AMP63 · 12-07-2004, 10:40 PM

So what carb should i buy?670 holley street avenger will give room to increase power later but a little too much now,570 holley street avenger would be enough for now but not later when i do more head work or buy heads and higher output cam.my local shop dont like the road demon...saying they caused problems and wouldnt back up the product and then there is edelbrock?

KiltedBanshees93GT · 12-08-2004, 09:40 AM

Ive heard good things about the Edlebrocks, but dont have any exp with them myself. As to size, I would just split the diff and go with a 600, not too big right now and you can get some good numbers without having to upgrade so soon with some tuning.

Just my .02
J

6T9PONY · 12-09-2004, 02:30 AM

I'd either go with the Road Demon or the Street Avenger. IMO stay away from the Edelbrock. I have an Eddy 750 manual choke on my '69. I haven't really had any problems with it and it's easy as hell to tune and work on, but you can make a lot more power with a Road Demon if you get it tuned right.

12-06-2004, 06:34 PM	#1
AMP63 Registered Member Join Date: Dec 2004 Posts: 3	66 289w carb question [FONT=Arial Black]does anyone know how well a holly 670 street avenger carb works om sb289 w/milled heads,headers comp cam weind stealth intake and what psi should the fuel pump psi be set to?

12-06-2004, 09:34 PM	#2
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Re: 66 289w carb question I use a 625 CFM Road Demon on my 306. It seems just about right. I would think that the 670 CFM Holley would be right at the upper limit for your 289. You can get away with a little over size since it has vacuum actuated secondaries. I certainly wouldn't go any bigger on that 289. Set the line pressure to about 7.5-8 psi. That should be plenty and won't over power the needles & seats on the carb. 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

12-06-2004, 09:41 PM	#3
AMP63 Registered Member Join Date: Dec 2004 Posts: 3	Re: 66 289w carb question thanks for the info...i heard from local parts store that that 670 holley str/av is more reliable and EASIER to keep tuned....do you think they're right or just telling me that.Iam having so many problems with my 650 d/p i am ready to make fishing weight out of it and its only 6mos old.

12-07-2004, 09:04 AM	#4
KiltedBanshees93GT Registered Member Join Date: Jun 2000 Location: Pigeon Forge Tn Posts: 611	Re: 66 289w carb question DoublePumpers can be more difficult to tune. Vac secondarys will make your life a lot easier. Tho I would either go for a 600 or 650. Just my .02 J __________________ ____________ '66 Mustang Coupe- AKA "Lenore" on disability for a (long) bit '93 GT Mostly stock AKA "Fawkes" Rice Haters Club Member #239 "I find your lack of faith...disturbing." "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." H. L. Mencken

12-07-2004, 10:40 PM	#5
AMP63 Registered Member Join Date: Dec 2004 Posts: 3	Re: 66 289w carb question So what carb should i buy?670 holley street avenger will give room to increase power later but a little too much now,570 holley street avenger would be enough for now but not later when i do more head work or buy heads and higher output cam.my local shop dont like the road demon...saying they caused problems and wouldnt back up the product and then there is edelbrock?

12-08-2004, 09:40 AM	#6
KiltedBanshees93GT Registered Member Join Date: Jun 2000 Location: Pigeon Forge Tn Posts: 611	Re: 66 289w carb question Ive heard good things about the Edlebrocks, but dont have any exp with them myself. As to size, I would just split the diff and go with a 600, not too big right now and you can get some good numbers without having to upgrade so soon with some tuning. Just my .02 J __________________ ____________ '66 Mustang Coupe- AKA "Lenore" on disability for a (long) bit '93 GT Mostly stock AKA "Fawkes" Rice Haters Club Member #239 "I find your lack of faith...disturbing." "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats." H. L. Mencken

12-09-2004, 02:30 AM	#7
6T9PONY All about the Windsor. Join Date: Feb 2000 Posts: 2,052	Re: 66 289w carb question I'd either go with the Road Demon or the Street Avenger. IMO stay away from the Edelbrock. I have an Eddy 750 manual choke on my '69. I haven't really had any problems with it and it's easy as hell to tune and work on, but you can make a lot more power with a Road Demon if you get it tuned right.

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