I have a 383 stroker in a 2800 lb. car with a 750 Quick Fuel carb.Sec(High speed air 33-idle air70-primary sqt. 31-second-42 primary jet 84-sec-92 and a 3.5 vac. and the back is blank.) My question is a have a chance to get a Pro Systems 850 and a 950. Do you think any of these will help me?
Posts: 11 | Location: Lake Worth Florida | Registered: January 30, 2009
Is the carb you have running well, or do you have problems? I didn't see much difference, if any between a BG 750 and a box Holley 850 on my 3200# 406 combo. I only run the 850 because it's a 4 corner idle circuit unit.
If your 750 is as good as it can be, you won't see much difference, although a lighter car like yours will accept more carburetor easily.
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Posts: 1842 | Location: Indy | Registered: November 21, 2008
84 and 92 jets? That seems like a lot in a 750. Usually the primary squirter is larger, are you footbraking? Is there a problem or are you wanting et improvement?
Posts: 1572 | Location: E TN | Registered: February 13, 2009
Originally posted by racerbug: I have a 383 stroker in a 2800 lb. car with a 750 Quick Fuel carb.Sec(High speed air 33-idle air70-primary sqt. 31-second-42 primary jet 84-sec-92 and a 3.5 vac. and the back is blank.) My question is a have a chance to get a Pro Systems 850 and a 950. Do you think any of these will help me?
First assuming there is nothing wrong with your current carb and it's tuned to match what the motor wants, if you are making more than 550 HP then a larger carb with provide more HP. The 850 up to 650HP and the 950 up to 725HP. Those power number don't mean you can't make more HP with them, just when they will start to hurt peak HP. A heavy car with a lower HP motor, usually a smaller carb will perform better on track than one sized for max peak power!
To answer some questions. It is in a no box car I do have a 2 step. The engine shop that helped me with the engine thinks it should be around 620 hp.I think the 750 is as good as it can get that is why I was looking to go to a bigger carb. But then I would have to start all over with the set up.
Posts: 11 | Location: Lake Worth Florida | Registered: January 30, 2009
If you have enough rear gear and stall converter it will go faster with larger car.
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Posts: 4285 | Location: United States of Texas | Registered: April 02, 2011
Originally posted by racerbug: To answer some questions. It is in a no box car I do have a 2 step. The engine shop that helped me with the engine thinks it should be around 620 hp.I think the 750 is as good as it can get that is why I was looking to go to a bigger carb. But then I would have to start all over with the set up.
My old 3600 # footbrake car picked up a good bit when I went from a 750 to an 850. Around 2 tenths and 3 MPH. It was a moderate 408 inch BBC with steel oval port heads, solid flat-tappet cam, only pushed 447 HP with the 750. Did not dyno it with the 850. It did require more fuel with the bigger carb, had to re-plumb the lines and add a bigger pump. The short times were immediately better, but it nosed over around 1000 Ft until I fed it better.
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First I would like to thank you all for you input. The reason I am being a pain is the track I raced at was 20 min. away. now I have to go 2.5 south- 2.5 north and 4.5 north west. I am not a carb guru. Like you guys So I need all the help I can get. My car runs 6.50 at 105.75in the 8th.-and 10.38 at 130.83.with the set-up on the 750. If I change to the bigger carbs where do I start? Again thank you all for any input that can help.
Posts: 11 | Location: Lake Worth Florida | Registered: January 30, 2009
What does your car weigh? 6.50's with 620 HP the car must be heavy. I'd work on getting it to run with what you have. What fuel are you running? Ever thought of going to methanol or E85?
Posts: 1572 | Location: E TN | Registered: February 13, 2009
Originally posted by racerbug: First I would like to thank you all for you input. The reason I am being a pain is the track I raced at was 20 min. away. now I have to go 2.5 south- 2.5 north and 4.5 north west. I am not a carb guru. Like you guys So I need all the help I can get. My car runs 6.50 at 105.75in the 8th.-and 10.38 at 130.83.with the set-up on the 750. If I change to the bigger carbs where do I start? Again thank you all for any input that can help.
Your west palm racer buddies were at Orlando last race, Orlando had 400 cars show up for a local.
Packed, rained off and on Orlando crew didn't disappoint, finished up Sunday after racing till 1 am.
That's your new home track.
Sounds like a half decent sbc, I wouldn't be afraid to try the 950.
I would try leaning it out about 2-4 jet sizes first it cost nothing and you seem to have Alot of jetting in it now I have a 406 with an 800 and don't run that much jetting.
I don't know what QF carb the OP has, but I looked at the specs for 2 different 750 QF carbs on their web site. Both list Pri. jets at 74 & Sec jets at 84 with primary PV only.
The 750 E85 QF carb list Pri. jets at 80 & Sec. jets at 90, just for reference.
2BKing
1980 Camaro Taking the Best Working Small Tire Shyt Box & making it Greater Than Before! 3000 lbs. Pump Gas 436
Posts: 2779 | Location: NV. | Registered: October 20, 2006
Originally posted by HR3377: I would try leaning it out about 2-4 jet sizes first it cost nothing and you seem to have Alot of jetting in it now I have a 406 with an 800 and don't run that much jetting.
Bigger engines take smaller jets, smaller engines take bigger jets - signal.
I would go to the track and have a good time win, lose or draw, testing and learning drag racing on my own terms, with whatever carb I felt was best.
No pain no gain.This message has been edited. Last edited by: Mike Rietow,
