BIGS CARBS, anyone use one???

429mustang · 03-05-2003, 05:48 PM

Anyone have any experience with a bigs double pumper?? I'm looking to get one soon.

Technick · 03-06-2003, 12:51 AM

No experience with a BIGGS carb. Lots of experience with the Demon carbs, love them, The race Demon works great at the track, the Speed Demons work great on the street. So far every single Demon carb that I have used has worked great out of the box with just minor tune in for the application. Easy to adjust and tune with ZERO dependability problems.

429mustang · 03-06-2003, 09:35 AM

Which one of the demons is similar to a double pumper, the speed demon? I'm looking for a double pumper style carb, I'll probably still want a choke on it (mechanical) cause it's driven everyday. I talked to bigs and let them know my whole engine setup, they said they'd let me know what would work best then they'd set it up before they shipped it out, plus they'll coat them to whatever color you want. I'll probably get one in mostly black with silver. Anyway, supposedly their carbs are supposed to have better response and have stepped up parts in them and whatever other work they do themselves to make it better.

Technick · 03-07-2003, 01:03 AM

Most of the Demon carbs are double pumper design. Some of the Street Demon carbs can be ordered with a vacume secondary. But if you need a choke order a Speed Demon and specify double pumper. They come in a silver/gold looking annodized finish. The best bet is to go to Barry Grants web site to see one or just look in any Summit or Jegs catalouge.

429mustang · 03-07-2003, 09:18 AM

How are the speed demons 650 compared to a holley 650 as far as response,etc.

Technick · 03-08-2003, 01:08 AM

The Demon carb is based on the basic Holley carb. All of the "bad" features of the Holley were eliminated and the carb was re-engineered. In my opinion it is head and shouders above the typical Holley. Throttle response is immediate and H.P. numbers will be much better. The big difference is that the Demon is milled from billit aluminum, whereas the typical Holley is cast. The milled billit is far and away smoother, more precise ect. No casting ridges, lines ect. Since the Demon is all done on a CNC machine every carb (of a given part #) is exactly the same. So if you have to buy a replacement part it will be exactly the same as the piec that you have. Also every venturi, float bowl, metering block in exactly the same, which makes for a much smoother, more equalized flowing carb out of the box.

429mustang · 03-08-2003, 05:17 PM

I may try one of the demons, which one would give the best performance but still have a manual choke? Also, if a 650 Holley Double pumper was good for my setup, would a Demon 650 work the sameas far as cfm size?

Technick · 03-08-2003, 11:56 PM

A 650 cm Demon will usually out flow a 650 Holley no problem, in fact you may wish to go even bigger. It is all about getting the air and fuel into the engine in the right ratio, carb size is often way under/over rated. I have seen a Holley 1050 Dominator work just fine on a 317 cid small block Ford. If you can get the air bleed ,jets, power valve, squirter, ect set up right you can often put on a larger carb than one would think and make great H.P. #'s. Call Barry Grant and ask. Give as much specifics as possible and they will get you set up right. Do not play a guessing game when it comes to carb size, do your homework and you will be much happier with the end result. I have used 750 cfm carbs on street 302's for years, we run a 850 Race Demon (flows about 925 cfm) on a 347 cid drag race engine. If you have a 429 you may be able to go much bigger without any problems. But if it is a real mild engine and you won't go over 5,000 rpm, then a 650 may be just right.

429mustang · 03-09-2003, 02:57 PM

The carb's actually for my astrovan, the motor's a 355 small block with ported/polished/milled w/perf valve job stock castings (edelbrock performer springs/aluminum 1.5 roller rockers), performer RPM cam/intake (port matched) perf. 600 carb, headers, pete jackson gear drive, built 700R4 trans (2200-2400 stall lockup converter). I know it's a chevy, but I wanted to get it all built and out of the way before I started on my 86 Mustang Big Block project, plus my family's owned the van since it was new so I don't want to get rid of it. Anyway, the 600 carb on it studders sometimes from off-idle, usually from around 10-20 mph, then takes off ok. Last night, I had it running in a parking lot for a few minutes while I changed wiperblades, it started dropping rpms after a couple of minutes then shut off. It started ok, but it seemed like it was flooding out at idle, but I just adjusted the idle mixture and even brought the screws in a bunch from where I started out. I try and mess with it today, but I'm definitely looking for something better/easier to mess with like a Demon or Holley.

03-05-2003, 05:48 PM	#1
429mustang Registered Member Join Date: May 2001 Location: westerville, OH USA Posts: 618	BIGS CARBS, anyone use one??? Anyone have any experience with a bigs double pumper?? I'm looking to get one soon. __________________ 1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns.

03-06-2003, 12:51 AM	#2
Technick Registered Member Join Date: Feb 2003 Location: Seattle, Wa. Posts: 175	No experience with a BIGGS carb. Lots of experience with the Demon carbs, love them, The race Demon works great at the track, the Speed Demons work great on the street. So far every single Demon carb that I have used has worked great out of the box with just minor tune in for the application. Easy to adjust and tune with ZERO dependability problems. __________________ No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!

03-06-2003, 09:35 AM	#3
429mustang Registered Member Join Date: May 2001 Location: westerville, OH USA Posts: 618	Which one of the demons is similar to a double pumper, the speed demon? I'm looking for a double pumper style carb, I'll probably still want a choke on it (mechanical) cause it's driven everyday. I talked to bigs and let them know my whole engine setup, they said they'd let me know what would work best then they'd set it up before they shipped it out, plus they'll coat them to whatever color you want. I'll probably get one in mostly black with silver. Anyway, supposedly their carbs are supposed to have better response and have stepped up parts in them and whatever other work they do themselves to make it better. __________________ 1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns.

03-07-2003, 01:03 AM	#4
Technick Registered Member Join Date: Feb 2003 Location: Seattle, Wa. Posts: 175	Most of the Demon carbs are double pumper design. Some of the Street Demon carbs can be ordered with a vacume secondary. But if you need a choke order a Speed Demon and specify double pumper. They come in a silver/gold looking annodized finish. The best bet is to go to Barry Grants web site to see one or just look in any Summit or Jegs catalouge. __________________ No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!

03-07-2003, 09:18 AM	#5
429mustang Registered Member Join Date: May 2001 Location: westerville, OH USA Posts: 618	How are the speed demons 650 compared to a holley 650 as far as response,etc. __________________ 1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns.

03-08-2003, 01:08 AM	#6
Technick Registered Member Join Date: Feb 2003 Location: Seattle, Wa. Posts: 175	The Demon carb is based on the basic Holley carb. All of the "bad" features of the Holley were eliminated and the carb was re-engineered. In my opinion it is head and shouders above the typical Holley. Throttle response is immediate and H.P. numbers will be much better. The big difference is that the Demon is milled from billit aluminum, whereas the typical Holley is cast. The milled billit is far and away smoother, more precise ect. No casting ridges, lines ect. Since the Demon is all done on a CNC machine every carb (of a given part #) is exactly the same. So if you have to buy a replacement part it will be exactly the same as the piec that you have. Also every venturi, float bowl, metering block in exactly the same, which makes for a much smoother, more equalized flowing carb out of the box. __________________ No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!

03-08-2003, 05:17 PM	#7
429mustang Registered Member Join Date: May 2001 Location: westerville, OH USA Posts: 618	I may try one of the demons, which one would give the best performance but still have a manual choke? Also, if a 650 Holley Double pumper was good for my setup, would a Demon 650 work the sameas far as cfm size? __________________ 1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns.

03-08-2003, 11:56 PM	#8
Technick Registered Member Join Date: Feb 2003 Location: Seattle, Wa. Posts: 175	A 650 cm Demon will usually out flow a 650 Holley no problem, in fact you may wish to go even bigger. It is all about getting the air and fuel into the engine in the right ratio, carb size is often way under/over rated. I have seen a Holley 1050 Dominator work just fine on a 317 cid small block Ford. If you can get the air bleed ,jets, power valve, squirter, ect set up right you can often put on a larger carb than one would think and make great H.P. #'s. Call Barry Grant and ask. Give as much specifics as possible and they will get you set up right. Do not play a guessing game when it comes to carb size, do your homework and you will be much happier with the end result. I have used 750 cfm carbs on street 302's for years, we run a 850 Race Demon (flows about 925 cfm) on a 347 cid drag race engine. If you have a 429 you may be able to go much bigger without any problems. But if it is a real mild engine and you won't go over 5,000 rpm, then a 650 may be just right. __________________ No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!

03-09-2003, 02:57 PM	#9
429mustang Registered Member Join Date: May 2001 Location: westerville, OH USA Posts: 618	The carb's actually for my astrovan, the motor's a 355 small block with ported/polished/milled w/perf valve job stock castings (edelbrock performer springs/aluminum 1.5 roller rockers), performer RPM cam/intake (port matched) perf. 600 carb, headers, pete jackson gear drive, built 700R4 trans (2200-2400 stall lockup converter). I know it's a chevy, but I wanted to get it all built and out of the way before I started on my 86 Mustang Big Block project, plus my family's owned the van since it was new so I don't want to get rid of it. Anyway, the 600 carb on it studders sometimes from off-idle, usually from around 10-20 mph, then takes off ok. Last night, I had it running in a parking lot for a few minutes while I changed wiperblades, it started dropping rpms after a couple of minutes then shut off. It started ok, but it seemed like it was flooding out at idle, but I just adjusted the idle mixture and even brought the screws in a bunch from where I started out. I try and mess with it today, but I'm definitely looking for something better/easier to mess with like a Demon or Holley. __________________ 1990 Notchback: BBK Ceramic Coated Full length headers, Dr. Gas 3"- 2 1/2" x-pipe, Flowmaster 40's/turndowns.

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