Want to Trade Holley 650cfm for 300-400 cfm carb. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BladeX · 09-08-2005, 04:32 PM

I bought a carb thats wAY to much for engine all it does it flood mu engine lol.it was just barely rebuilt less then 100 miles ago. Its a Holley 650cfm 4brl.

Im lookin for somethin for my engine 305cid somewhere in the 3-4 hundred cfm range. Im on border of TN and KY.

Lemme a message.

*iceman7329* · 09-08-2005, 05:03 PM

I may know some one who can help you, back in a day or two.

motocrosschump · 09-13-2005, 11:30 AM

you might want to check your float level or pump psi

ChadMorris · 09-14-2005, 07:11 AM

I have a Holley 390 CFM that I would be willing to sell, it was completely rebuilt.
I'm asking 175.00 shipping included
I had it on my inline 6.

Thanks
Chad

*gn4u2c* · 09-14-2005, 11:17 AM

650 is a little much but should run fine. with the truck running adjust the floats so fuel is just at the bottom of the sight hole. it should just barley trickle out. on the secondary side you should adjust go 3/4 throttle quick then look and readjust as you need to pull fuel out of that bowl to lower the float. hook up a vac gauge and aadhust the idel mixture for max vac be sure to turn both the same amount 1/8- 1/4 turn at a time most.
You can also step down a few jet sizes this is also easy. check what you have with the floats corrected and good idel mix you may be ok there. Holley are the best carb out there if tunned corretly. Any local performance sho has holley jets .

BladeX · 09-14-2005, 11:44 PM

Yeh all that stuff ya said is brain surgery for me....haha

cableguy0 · 09-15-2005, 01:00 PM

300 or 400 cfm is wayyyyyy too small for a 305 inch motor. your carb just needs adjusted

BladeX · 09-15-2005, 05:53 PM

I turned it all the way lean and it still runs. It dosnt even cut off.

cableguy0 · 09-15-2005, 08:51 PM

that floats must be too high and its possible the timing is off as well. the carb needs to be adjusted properly.

BladeX · 09-15-2005, 11:28 PM

timing is perfect. i know nothing bout floats.

SSC's76 · 09-17-2005, 11:36 AM

Quote:

Originally Posted by BladeX

I turned it all the way lean and it still runs. It dosnt even cut off.

Floats too high and or PV blown. Nothing wrong with using a 650 CFM vac sec carb on a 305. A q-jet in stock for will flow 750-780 cfm of course the demand has to be there to pop the secondaries full open to see that kind of flow.

09-08-2005, 04:32 PM	#1
BladeX Registered User Join Date: Dec 2003 Location: Kentucky, Ft. Campbell Posts: 287	Want to Trade Holley 650cfm for 300-400 cfm carb. I bought a carb thats wAY to much for engine all it does it flood mu engine lol.it was just barely rebuilt less then 100 miles ago. Its a Holley 650cfm 4brl. Im lookin for somethin for my engine 305cid somewhere in the 3-4 hundred cfm range. Im on border of TN and KY. Lemme a message.

09-13-2005, 11:30 AM	#3
motocrosschump Registered User Join Date: May 2005 Location: Texarkana, AR 71854 Posts: 397	you might want to check your float level or pump psi __________________ 2006 Titan SE Crew Cab Daily Driver 2005 Mazda Tribute (Wifes car) 1969 C10 SWB 350/3 Fleet "Max" 1969 Chevelle 2 door 350/3

09-14-2005, 07:11 AM	#4
ChadMorris Newbie truck Rebuilder! Join Date: Dec 2004 Location: Huntsville, Al Posts: 160	I have a Holley 390 CFM that I would be willing to sell, it was completely rebuilt. I'm asking 175.00 shipping included I had it on my inline 6. Thanks Chad __________________ "Old Blue" 1964 GMC Fleetside in pieces 350 TPI with 700R4 tranny now installed( well kinda propped in place until the tranny crossmember is bolted in !!!!! 1995 Toyota 4runner , 197,000 miles and going... 2007 Honda Odyssey Van (Wifes car)

09-15-2005, 01:00 PM	#7
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	300 or 400 cfm is wayyyyyy too small for a 305 inch motor. your carb just needs adjusted __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

09-15-2005, 08:51 PM	#9
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	that floats must be too high and its possible the timing is off as well. the carb needs to be adjusted properly. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

09-08-2005, 05:03 PM	#2
iceman7329 Account Suspended Join Date: Mar 2005 Posts: 453	I may know some one who can help you, back in a day or two.

09-14-2005, 11:17 AM	#5
gn4u2c Account Suspended Join Date: Mar 2003 Location: southern pa Posts: 698	650 is a little much but should run fine. with the truck running adjust the floats so fuel is just at the bottom of the sight hole. it should just barley trickle out. on the secondary side you should adjust go 3/4 throttle quick then look and readjust as you need to pull fuel out of that bowl to lower the float. hook up a vac gauge and aadhust the idel mixture for max vac be sure to turn both the same amount 1/8- 1/4 turn at a time most. You can also step down a few jet sizes this is also easy. check what you have with the floats corrected and good idel mix you may be ok there. Holley are the best carb out there if tunned corretly. Any local performance sho has holley jets .

09-14-2005, 11:44 PM	#6
BladeX Registered User Join Date: Dec 2003 Location: Kentucky, Ft. Campbell Posts: 287	Yeh all that stuff ya said is brain surgery for me....haha

09-15-2005, 05:53 PM	#8
BladeX Registered User Join Date: Dec 2003 Location: Kentucky, Ft. Campbell Posts: 287	I turned it all the way lean and it still runs. It dosnt even cut off.

09-15-2005, 11:28 PM	#10
BladeX Registered User Join Date: Dec 2003 Location: Kentucky, Ft. Campbell Posts: 287	timing is perfect. i know nothing bout floats.



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