Which Carburetor?

N

nitrous21

New Member

Aug 23, 2007

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Aug 29, 2007

#1

• Aug 29, 2007

• #1

I have a 351c 2v with the stock iron heads that have been machined.
Comp Ratio is 10 to 1 with a Max RPM of 7300.
@.050 Intake Duration is 254 Max lift 105
Exhaust Duration is 262 Mas Lift 115

Car is mostly for the strip with rare street use. Nitrous is planned for the future.

I called both holley and BG and got very different recommendations from both, so I was wondering what the carb experts around here would recommend? Thanks for looking, cheers!


Marc

 

rbohm

Founding Member

Apr 12, 2002

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tucson,az

Aug 29, 2007

#2

• Aug 29, 2007

• #2

in this case i would go with a 750 double pumper carb, either the holley or the speed demon carb.

 

BullittStangV8

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Oct 5, 2002

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NJ

Aug 29, 2007

#3

• Aug 29, 2007

• #3

I would call pro-systems. At the very least, talk to their techs and ask for their opinion. My experience with them was great.

 

S

Soaring1

Banned

Jan 3, 2003

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Texas

Aug 29, 2007

#4

• Aug 29, 2007

• #4

If you trust CFM calculators try this one to get you into the ballpark.
Carburetor CFM Calculator
http://www.4secondsflat.com/Carb_CFM_Calculator.html

 

B

bnickel

Founding Member

Aug 21, 2002

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lubbock, texas

Aug 29, 2007

#5

• Aug 29, 2007

• #5

well, BG rates their carbs a little differently than Holley which would probably explain the different recommendations. for the Holley i would recommend a 750 dual feed vacumm secondary if you have an auto trans double pumper mechanical secondary if manual trans.

BG would be 725 and same recommendations for manual and auto trans

possible exception would be if you have a really high stall convertor, over 3500 stall, then i would probably use a mechanical secondary carb for either manual or auto trans but that would also depend on gearing, if 3.50 or over definitely use the mech. sec, if under 3.50 gearing i'd still use the vac. sec. carb.

 

ratio411

Founding Member

Apr 21, 2002

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Pensacola FL

Aug 29, 2007

#6

• Aug 29, 2007

• #6

750 DP vote here.

 

D

D.Hearne

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Sep 29, 2000

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south louisiana

Aug 29, 2007

#7

• Aug 29, 2007

• #7

I want to know how he got a 10 to 1 comp ratio with the stock 2 bbl heads. I think I'd go with a 650-700 cfm double pumper or a 750 VS.

 

brianj5600

Active Member

Sep 19, 2003

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Aug 29, 2007

#8

• Aug 29, 2007

• #8

I hope he has more than 3500 convertor. That cam won't make any power til 4000. 750dp!

 

N

nitrous21

New Member

Aug 23, 2007

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Aug 29, 2007

#9

• Aug 29, 2007

• #9

4800 stall converter good people :o)

 

Shamus O'toole

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Jul 3, 2007

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Aug 29, 2007

#10

• Aug 29, 2007

• #10

I personaly have had great results with Quick Fuel carbs. I run a 750 Pro series. I would highly recomend it.

 

ratio411

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Aug 30, 2007

#11

• Aug 30, 2007

• #11

D.Hearne said:

I want to know how he got a 10 to 1 comp ratio with the stock 2 bbl heads. I think I'd go with a 650-700 cfm double pumper or a 750 VS.

Click to expand...

Well, they were 9:1 stock.
I am curious to know how as well, but it's not a stretch.

 

6

'69Stang

Founding Member

Sep 28, 1999

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Metro Detroit

Aug 30, 2007

#12

• Aug 30, 2007

• #12

750 Holley DP

Holley 750 DP with mechanical secondaries. That cam will use it. 10:1 with pistons is no problem, or milling the heads, or a thinner head gasket.

 

brianj5600

Active Member

Sep 19, 2003

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Middle TN

Aug 30, 2007

#13

• Aug 30, 2007

• #13

This piston says 10.22 with 76cc heads. http://store.summitracing.com/partdetail.asp?part=TRW-L2348F30&autoview=sku

 

ratio411

Founding Member

Apr 21, 2002

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Pensacola FL

Aug 30, 2007

#14

• Aug 30, 2007

• #14

Yeah, that piston is definately a compression builder.
Much more aggressive than stock...

 

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D

D.Hearne

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Sep 29, 2000

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Aug 30, 2007

#15

• Aug 30, 2007

• #15

OK, domed, I got it, I didn't realize they worked with the open chambers too. I fugured he was doing it with the flat tops.

 

jadesville

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Aug 31, 2007

#16

• Aug 31, 2007

• #16

Another vote for calling pro-systems. You won't get let down.