So I can get it on the track. BUT, I'm having some MAJOR carb problems. The carb is an Edelbrock 600. Ya'll prolly have an idea on my engine combo, but here's a refresher. 302 +.040, Flattop aluminum pistons, Ported/polished/shaved heads, Holley Street Dominator intake, Edelbrock 600 carb, Summit .448intake/.478exhaust cam, long tube headers, 2 1/4 inch exhaust. Probably forgetting something (as usual ) but that's the gist of it anyway. Well, here's the problem. Car runs great at partial throttle-pulls hard, but at WOT it bogs/shudders/cuts out. Let up on it and it comes right back to life. So there is no way that I can go to the track like this. I have tried all three positions on the accelerator linkage- if there was a difference, I couldn't feel it. I tuned the car with a vacuum guage and it reads 19 lbs constant at idle. Blip it it goes down and comes right back to 19. I have tuned and turned and fiddled with this carb until I am at my wits end. Any suggestions? BTW- This week I'll be adding new 4 leaf springs/shackles, new rear axle (5 lug) with 3.80 gears, disc brakes, 275/60/15 rear tires on 15x8 wheels, and 215/65/15 front tireson 15x7 wheels. Might cut a coil out of the front springs or put my 6 cylinder springs back in. It will depend on the stance once all of this other stuff goes on there. Anyway, hoping to do decent when I get to race her. BUT, this stuff won't do me ANY good if I don't get my carb problem solved......... Sorry it was so long, and thanks in advance!!! Preston
I feel for ya, mines doing the same thing. I let the car sit for a year and everything gummed up in the carb. Had to take it completely apart, thoroughly blow all the orfices out and put a new kit into it. It's better but still slightly there. I drove the car but it ticked me off that I still couldn't punch it without the stumble. I guess I'll have to take it apart again
i would guess your having a fuel delivery problem. what kind of fuel pump are you running? also make sure the gas filter is clean. if it pulls to a certain rpm then sputters it might also be an ignition problem. the stock units were only good to about 5000rpm.
A buddy of mine recently had the exact same problem at the track. We read the plugs, made jet changes until we were blue in the face. Turns out, his fuel pump was not delivering enough fuel to the cylinders (at max psi). A new and bigger Holley fuel pump did the trick (then it was back to chasing the jetting again - Ha!) You might consider it anyway. Good luck and keep us posted.
If it were a Holley I'd tell you to increase the front shooter size. Sounds like you're experiencing fuel starvation at the throttle tip-in. Not sure how to cure that particular problem with an Edelbrock carb. You might see what the factory has to say about how to cure it. Or throw that Carter AFB look-a-like in the street and run over it.
That's about what I'm ready to do! If you guys think it could be fuel starvation, then that'll be my next move. I had talked to maverick1970 on the phone awhile back and he had mentioned that also.........just haven't had time to fiddle with that. Holley Blue is a good pump-correct? Just noisy.........any others pretty decent? Thank you all for this!! Preston
i just picked up a holley blue tonight at the speed shop. it's good up to 14 psi nand comes with a regulator to adjust it. i run 7 psi and don't have a problem with my 308 and holley 750hp double pumper. p.s. that's not 750 horsepower. i wish.
I hear you on that one Mr. Graham. I just wish that the Blue wasn't so noisy. Guess I'll go pick one up in a few minutes. Thanks y'all. Let's all keep our fingers crossed!!! Preston
country mav....i am running about the same exact setup as you....everything...except i have 9.5:1 flat top pistons and i am running a 484 lift cam... complete MSD ignition....and the fuel pump is from a 75 ford f100 truck (mechanical)...since that was the engine i have..... and i have none of the problems you are having..... i think the 600 is a good carb....havent had a single problem with mine ( and i bought it used from summit)...except i think it needs to be jetted up a bit...
Was going through some old posts as I am still having this problem. I changed the step-up spring on the carb and it got a little better... but not much. I have a Crane Cams electronic ignition kit that replaced the points. I also installed a Holley Blue pump. Noisy but it does its job. Anywho, any ideas y'all? Or just buy a new carb? Also, I did install the 4 leaf springs, the 5 lug rear end (stock gears though), disc brakes, the rims and tires.... I think that's all. I just need to get this problem lined out. So the car will be more fun to drive, if nothing else! Sorry to reach so far back in time... Thanks y'all!
What valve springs are you running. Since you chased everything else I wonder if there may some valve float.
does it instantly bog when you floor it? does it bog only in the higer rpms? my first thoughts were the secondary fuel circut is pluged up. also those carbs lock out the secondarys when the choke is on. some times the lock out mechinism will stick and not allow the secondarys to open. usualy the motor will run out of power around 3000- 3500 rpm when this is the problem.
Well, I honestly don't know what valve springs are on it. The heads were ported, polished and shaved several years ago. It's been too long... It bogs instantly when I go WOT. The higher I can get my RPMS before I pin it WOT, the better it does. For example, from 1000 RPMs going WOT will bring on a serious bog. From 3000, not as bad... Does that make sense?
I just spent for months and rebuilt the engine on my bike because it was doing the same thing. turned out I had rust build up in the tank that was partialy blocking the pickup. could be that
