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11-24-2003, 09:17 PM
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why the bog
im running a 307 in my gmc sprint a basic stock 1972 motor it has stock intake with a holley 650 carb with a adapter plate 1/2 inch size.when in idle i can gas it it revs fast and smooth but on pavment it kinda bogs and then picks up and runs very strong.i cant even turn the tires with out power braking it.it seems to have the power but dont know how to relase it help i want to burn rubber what would any you guys suggest
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11-24-2003, 09:29 PM
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ha ha, that's cool how you just said "yeah, I just want to burn some rubber here." Carb sounds a bit big to be honest. If you want to burn those tires you need a couple of things. First of those things is low end torque. YOu can get more of that by getting a smaller carb (you could run a 500 on that motor, no problem). That spacer isn't helping anything either. The further you get the fuel away from the intake the longer it takes to accelerate into the ports. That means you're going to get your power (and more of it) at a higher RPM. That's the principle behind tunnel rams too.
An aftermarket intake would liven things up a bit too. If you decide to get one make sure you get a duel plane. Higher gears or smaller tires (second option not recommended) will help you to burn too. Lastly, an RV cam will give you some torque to fry some rubber. 307's are all ready good with torque, you shouldn't have too much problem. Good luck! K
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11-24-2003, 09:34 PM
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thanks killer formula ill try your advice as soon as george bush sends me some money to play with
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11-24-2003, 09:45 PM
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LOL
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11-25-2003, 06:42 AM
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my buddy has a 72 satelite with a 318 in it and he just put big e's heads on it and a bigger cam and a new dual plane intake on it (the motor was already reuikbt last year, just making it faster now) and then he threw a edelbrock 670 on it, and i know they dont make 670's, but they put 700 jets in the 650 and so it made it a 670 for some reason. but anyways, everytime he got on it after he rebuilt the motor again he would bog down and not go anywhere for a sec, he still hasnt gotten it fixed but he knows that its the carb, it is just putting to much fuel to the motor. so killer formula is porb right!
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11-25-2003, 07:24 AM
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67bird quote:
but they put 700 jets in the 650 and so it made it a 670 for some reason. You can't make the carb bigger just by adding the same jets from a bigger carb to make a carb larger. Their the SAME JETS no matter what Holly carb you have. 75sprintguy Take killerformula's advice and get a smaller carb with vacuum secondaries. If it a 650 vac. get rid of the spacer plate especially if its an open one, and a tuning kit from Holly to dial it in. Here is Hollys site for working on it. http://www.holley.com/HiOctn/TechSer...o/FMCTech.html http://www.holley.com/HiOctn/TechSer.../Instruct.html
__________________
Luv the smell of NITRO in the morning.
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11-25-2003, 07:32 AM
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Quote:
 Tell him to hurry and make an offer now, it won't last long! 
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11-25-2003, 10:11 AM
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stupid post
? What's this crap about a bridge? Yeah... don't quit your day job man.
K
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11-25-2003, 01:35 PM
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Like the guys says, the carb is more than you need. However, you should make it run ok with that carb too (and waste fuel along with it).
Is it a spreadbore or squarebore? Spreadbore has bigger secondaries. If so stop reading and get a new one. Double pump or vacum? Could it be that the acc.pump is not working as it should? The floats (or on sec. at least) can be too low adjusted. How´s your timing (ignition)? Too low advance will make the engine more thirsty = lack of fuel? Too small jets? Good luck
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11-25-2003, 01:52 PM
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"? What's this crap about a bridge? Yeah... don't quit your day job man.
K" Excuse me for my indiscretion...my comment about the bridge was meant only in humor based on your comment about your friend changing the cfm rating of a carburetor by changing its jets. It was intended for a person who likes to laugh at their own foibles. 
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11-25-2003, 04:19 PM
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well you know it is a good thing that i dont remember asking yall what i thought so i dont really care what yall have to say about my friend. he bought it from a speed shop and they said that they did some things to change the cfm up to 670 and putting VERY big jets in it was one of them. i didnt make any comments about yall or what yall had to say except that i agree, and this statement is really going to the ******* who said go buy a bridge! i mean what the hell! you really do need to get out some more since u can find a bridge for sell!
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11-25-2003, 05:02 PM
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You can tell its almost Christmas time, lots of folks gettin cranky!! LOL
Mark
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11-25-2003, 05:41 PM
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Any idea on how long that bridge was ?
Maybe it was 67bird adding something other than a answer to the posting.
__________________
Luv the smell of NITRO in the morning.
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11-25-2003, 08:02 PM
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well guys did not mean to start nothin guess im a trouble maker.any way took off the spacer, rejetted , adjusted,timing.bam! a nice burn out.and better throttle response.thanks to all.ill go do a burn out on a bridge for all u guys.rock on
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11-25-2003, 10:34 PM
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Glad to hear it, man
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