This is topic carburetor help.... in forum Tech Talk at Northern California Ford Owners  .


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Posted by 2Coupes (Member # 5617) on :
 
i have a 68 stang with an electric holly blue fuel pump a 302 with gt40 cast heads mild comp cam and an edlebrock intake. i have a holly 680cfm street avenger. this carb seems over kill to me and im looking to purchase an smaller carb any recommendations on brand and size.? any help u can offer would be greatly appreciated. thanks [patriot]
 
Posted by 68dustin (Member # 5388) on :
 
JETTER'ER DOWN!! why do you think it's too big. It's a little big for the motor (cfm wise), but nothing crazy. How is it acting?

[ 2014-07-14, 03:51 PM: Message edited by: 68dustin ]
 
Posted by LXjames (Member # 10791) on :
 
I have the same exact carb on a 302 with eddie heads and intake and custom cam. What's your problems I might know a few tricks.
 
Posted by warhorse58gt (Member # 7702) on :
 
Yes it is a little to big for your comp. But it's not so big you should be having problems. What is it doing? With your combo. I'd be looking for a 600cfm Holley style 4150 dp. But the street avenger you have, has vac 2nd's. So you can change the spring to have the secondaries open slower. I'm sure you just need a little tweak to it.
 
Posted by dohcfox (Member # 12829) on :
 
W have the same engine setup in one of our race cars. Played with it for a long time and actually found a holley 2 barrel 500 cfm to me the best. Throttle response is linear. And the 500 holley outperformed on the dyon several 4 bbl setups of various sizes.
 
Posted by 2Coupes (Member # 5617) on :
 
At this point I no longer have any adjustment springs. I'm trying to get a fresh start think this carb is like 7 years old.
It was never very responsive and bogged alot car still runs and drives but no performance.

I really just wanted some advice on brand and size. I'm not gonna mess with this carb. I'll probably sell it for what ever I can get.
 
Posted by 2Coupes (Member # 5617) on :
 
Also I was wondering the +\- of going with vacuum or mechanical secondarys. Thanks guys would love to get this sucker back on the road.
 
Posted by warhorse58gt (Member # 7702) on :
 
Now this is pretty blanketed statement. But here it goes. Most vac secondaries aren't the best carbs for performance. I'd go with a double pumper. I.e. mech seconds. I would stay in the 600cfm range. I wouldn't go bigger than a 650cfm. Get a 4150 style flange.
 
Posted by 4IDFOX (Member # 9921) on :
 
I would suggest pro systems. Go to his site and fill out the tech sheet and submit it. He will build a carb that will run perfect. He will tell you what size is appropriate for you combination. His 4150 dp's are $640. Best deal on a good carb.
 




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