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Author Topic:   What is best for me?
65_289
Gearhead

Posts: 396
From:
Registered: Jul 2001

posted 09-12-2001 07:06 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
I am looking for a new carb. I am thinking either a 650 or 700 DP. I have the mods in my sig. The cam is 224 @ .050 and .480 lift. Thanks for the help!!!

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Pertronix Ignitor & Flamethrower coil, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 09-12-2001 09:00 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
650DP is plenty. I don't agree that all the BG stuff is junk. My 750 Speed Demon seems to be a quality piece. It idles quite a bit cleaner than the DP it took the place of, and has given me no trouble. It came jetted a bit lean, and needed bumped up a few sizes.

However, my engine didn't seem to need any more carburetor. It ran cleaner, but didn't pick up any at the strip over my slightly modified 650DP.

One thing I WOULD look for are downleg boosters. The 650 Holley DP's come with those junky straight-leg boosters. (My 650 had the downleg boosters installed in the secondaries). The Demon carbs come with downleg boosters from the factory. If you really want to go with a Holley, and don't care to spend the money for the carbs that serious racers are used to running, go for the 650HP series Holley. They come with all the good stuff from the factory.... along with a $600+ pricetag.

I purchased the Speed Demon because it was $399, and seemed like a good deal.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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chips67
Gearhead

Posts: 537
From: louisville, ky, usa
Registered: Jul 2001

posted 09-12-2001 09:05 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
what is the difference between the performance of a carb with/without downleg boosters? i have the straight type now. also i have the choke plate still in place inside the air horn, any gain taking it off? also, is the choke horn itself hurting me?

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.78 60ft. time.

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JAAZZY
Gearhead

Posts: 666
From: Bay Area, CA
Registered: Apr 2001

posted 09-12-2001 09:23 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
A 600DP was enough for me in my 289 so a 650DP should be plenty. I used the 4150 series 600DP. It was much better than the Holley vacum secondary I used before. I'll guess that you are turning probably 6000rpm with that cam. Based on 100% volumetric efficiency your motor would need about 525cfm at that rpm((CIDxRPM)/3456). 650DP should give you some room to grow.

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 09-13-2001 07:07 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
what is the difference between the performance of a carb with/without downleg boosters? i have the straight type now. also i have the choke plate still in place inside the air horn, any gain taking it off? also, is the choke horn itself hurting me?


The downleg boosters provide a better signal and offer less of a restriction to flow.

Removing the choke plates might give a -slight- gain in flow. Milling the air horn off won't do much by itself... unless you have a short air cleaner whose lid is down close to the carb... then it might open up a little breathing room.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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bluestreek
Gearhead

Posts: 607
From: Athens,GA
Registered: Jul 2001

posted 09-13-2001 07:21 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
I agree with Jaazzy.. 600 DP should be fine for now. I am currently running a Holley 390 CFM DP and I am able to easily and cleanly run a 13.90 1/4 mi @ 100 mph on true street tires.. It only uses 56/60 jets.. Throttle response is nothing short of wonderful!!
Jet Performance has a good reputation for customizing carbs to suit your particular engine combination..

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'66 Stang with traction problem!!
289 320hp 4 spd 3.50 trac-loc
http://www.picturelist.net/Images/dbhard/1966.jpg

[This message has been edited by bluestreek (edited 09-13-2001).]

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 09-14-2001 10:17 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
This is a good company that does fine work. They also sell on ebay. They sell there often, and have an extremely positive feedback record. The vast majority of folks respond saying their products are better than advertised. The company's name is "Bigs"

Heres a custom calibrated 650HP Series Holley Double Pumper. You can lood at the feedback, and from there you can link to the auction the feedback is responding to. The selling price will be listed, so you will have an idea as to what they go for. They seem like a good deal for the money.

I guess you could also buy direct from them.

Good Luck!

http://cgi.ebay.com/ebaymotors/aw-cgi/ebayISAPI.dll?ViewItem&item=595425786&r=0&t=0

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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 09-14-2001 10:26 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
For those of you who like the bigger carbs...

http://cgi.ebay.com/ebaymotors/aw-cgi/ebayISAPI.dll?ViewItem&item=595425196&r=0&t=0

These custom modified carbs are also set up for your application and usually sell for about the same or LESS than the plain HP carbs from Summit or Jegs.

Good Luck!
------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

[This message has been edited by n2oMike (edited 09-14-2001).]

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65_289
Gearhead

Posts: 396
From:
Registered: Jul 2001

posted 09-14-2001 10:49 AM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by n2oMike:
This is a good company that does fine work. They also sell on ebay. They sell there often, and have an extremely positive feedback record. The vast majority of folks respond saying their products are better than advertised. The company's name is "Bigs"

Heres a custom calibrated 650HP Series Holley Double Pumper. You can lood at the feedback, and from there you can link to the auction the feedback is responding to. The selling price will be listed, so you will have an idea as to what they go for. They seem like a good deal for the money.

I guess you could also buy direct from them.

Good Luck!

http://cgi.ebay.com/ebaymotors/aw-cgi/ebayISAPI.dll?ViewItem&item=595425786&r=0&t=0


That looks awesome, but I think that is an all-out race carb. I need a choke and stuff, because this is my daily driver.


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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 09-14-2001 10:58 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 65_289:
That looks awesome, but I think that is an all-out race carb. I need a choke and stuff, because this is my daily driver.

They sell carbs with chokes as well. They can set you up with whatever you want. They could set up a "standard" double pumper with good boosters, etc. and leave the choke. Their number is in the ad.... might be worth a call. Tell them what you've got, and they will give you a recommendation.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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65_302
Journeyman

Posts: 45
From: Bixby, OK
Registered: Jul 2001

posted 09-14-2001 12:00 PM     Click Here to See the Profile for 65_302   Click Here to Email 65_302     Edit/Delete Message   Reply w/Quote
Do the Bigs carbs come with downleg boosters? Have you actually used one of Bigs' carbs?

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bluestreek
Gearhead

Posts: 607
From: Athens,GA
Registered: Jul 2001

posted 09-14-2001 01:37 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
Does anyone know where BIGS is located??
---------------
Nevermind.... I found out that they are in Wisconsin..

[This message has been edited by bluestreek (edited 09-14-2001).]

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 09-14-2001 02:43 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by 65_302:
Do the Bigs carbs come with downleg boosters? Have you actually used one of Bigs' carbs?

I'm sure they can build a carb however you want. I, personally have not run one, and did not know of them when I purchased my Demon. If you want to consult those who have, here's a link to BIGS feedback record. You can see what they have to say, and contact them if you have any questions.

Customer feedback is "sterling".... practically everyone praises them. I consider this a good judge, especially with the sometimes tempermental nature of carburetors.

Here's the link...
http://cgi2.ebay.com/ebaymotors/aw-cgi/[email protected] om

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

[This message has been edited by n2oMike (edited 09-14-2001).]

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n2oMike
Gearhead

Posts: 719
From: Spencer, WV
Registered: Jan 2001

posted 10-01-2001 05:32 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Here's the rundown on a BIGS rebuilt 650DP carburetor... and dyno test.

http://www.fordmuscle.com/archives/2001/09/bigs/index.shtml

Have Fun!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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