is 625cfm to big for a 305?
10-16-2002, 03:57 PM
#1
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Join Date: May 2002
Location: oakland,md,usa
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is 625cfm to big for a 305?
i have a 305 thats stock except for hedders and intake,and a 625 road demon carb.it idles and revs great but when im driving and stomp it,it tries to stall until i back off.i know i can unhook the four barrell but can i turn the gas down if the motor gettin to much?
10-16-2002, 04:05 PM
#2
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Join Date: Jun 2001
Location: TX
Posts: 1,211
Gm used the Qjet on some 305's and they are 750's, so I don't think you are overcarbed. Look at your accelerator pump shot or the secondary opening point. Is that Demon a double pumper? If so....
I always prefer vacuum secondary.
I always prefer vacuum secondary.
10-16-2002, 04:45 PM
#3
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Join Date: Sep 2002
Posts: 107
See if it has that vacuum diaphram on the side. If so you should be fine with that. If you accelerator pump is working right then you may have to soft of a spring in the diaphram and it is allowing the secondaries to open to quickly for the breathing capacity of the 305. If it is mechanical secondaries then that could be a problem with an automatic with stock stall converter and typical stock gears.
10-16-2002, 05:33 PM
#5
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Join Date: Nov 2000
Location: Sterling Heights, MI
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Re: trhgrthr
Originally posted by AutoRoc
IS the choke open? My Holley 600 has an electric choke but sometimes it sticks shut very tightly and anything past 1/4 throttle is terrible. I have to stab at i with my finger to open it. Goodluck!
IS the choke open? My Holley 600 has an electric choke but sometimes it sticks shut very tightly and anything past 1/4 throttle is terrible. I have to stab at i with my finger to open it. Goodluck!
)
10-16-2002, 06:00 PM
#6
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Join Date: Jul 2001
Location: Calgary, Alberta, Republic of Western Canada
Posts: 550
Re: Re: trhgrthr
Originally posted by IROC5.7TPI
<Note to self: Keep the tuned port injection )
<Note to self: Keep the tuned port injection
)
10-16-2002, 07:01 PM
#8
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Location: Clovis, NM
Posts: 878
I wouldn't go any bigger than a 650 vaccume 2ndary (any square bore) on a stock or near stock 305.
Look at the secondarys sound like to much fuel.
Have some one fallow you and hit it and have them look out for black smoke.
Look at the secondarys sound like to much fuel.
Have some one fallow you and hit it and have them look out for black smoke.
10-16-2002, 11:48 PM
#10
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Join Date: Feb 1999
Location: Springfield,OH. U.S.A.
Posts: 2,947
Aren't the Road Demons' mechanical secondary's?
I agree with too soon openining secondaries killing the port velocity and falling on its face.
Try rolling into it until a higher rpm then stab it. If Ok then, we're right...
Also a great near perfectly self calibrating overlooked carb for the street is the odd looking "Predator" carb. Only a restriction when used in big cube or hot performance app's.
I agree with too soon openining secondaries killing the port velocity and falling on its face.
Try rolling into it until a higher rpm then stab it. If Ok then, we're right...
Also a great near perfectly self calibrating overlooked carb for the street is the odd looking "Predator" carb. Only a restriction when used in big cube or hot performance app's.
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