Hesitating Holley

[YENKO DEUCE REGISTRY]

Hey Pete;
Tried the clear pump cam, good call!! This woke the car up a bit, still a little stumble left so I'm going to put in the jets that you suggested. Thanks for the advice [img]/ubbthreads/images/icons/smile.gif[/img]

[YENKO DEUCE REGISTRY]

Pete;
What's a vent baffle?
[img]/ubbthreads/images/icons/confused.gif[/img]

[Chevy454]

Not to "interrupt" here, but what Pete is talking about is a brass(?) piece hangs on the 2 studs near the top of the metering block, and keeps fuel from exiting out the vent. I have one in my pocket (don't ask![img]/ubbthreads/images/icons/grin.gif[/img]), and I will try and nab a picture here in a second.

[COPO PETE]

The vent baffle is better than the little piece of brass Rob is talking about. Jegs or any speed place sells them. They are a plastic tube about 2 inches long that snaps in place of the brass wannabe. To see if you really need it, take of the air cleaner lid and put about a 5 or six inch piece of rubber gas hose in a "u" shape connecting the two vent tubes on your holley. Cut a little hole in the top of the hose so it can breath. Take the car out and run the [censored] out of it.....well, for about 60 feet. If your stumble goes away, you need 'em. What squirter are you running Marlin???
Hey Rob, great buddy of yours on the Buick site, he knows all!!!!
Peter [img]/ubbthreads/images/icons/smirk.gif[/img]
"Censored".........WTF is that!!!!!....oops

[Chevy454]

Ok, I will snap a picture of an OEM vent baffle! What advantage does the aftermarket have over the OEM Pete? I would have assumed the factory piece worked.

As for 99Z1LE...let's just say "he's not well"[img]/ubbthreads/images/icons/smirk.gif[/img]!

[YENKO DEUCE REGISTRY]

Thanks for the tip, I will give that a try as well. I don't know which squirter Dotterer put into it. I was hoping to get rid of the stumble without taking it out, since I didn't have another one to try yet, and I was concerned about dropping something down the carb. I will have to stuff some rags, and take it out to see the number.

The first step is to richen up the primaries since I put 68's in there trying to keep the plugs from fowling. I think I fixed the plug problem by adjusting the mixture screws based on the vacuum reading.

Exactly how do you set the accelerator pump adjustment?

I have no problem taking it out and running the 'feces' out of it for 60+ feet! The only thing better than that is kicking some Rice Derier'.
[img]/ubbthreads/images/icons/grin.gif[/img]

[COPO PETE]

Marlin....You better have a look at squirter size right away. Very important part of your stumble. Use some needle nose vise grips to grab that little devil!
Peter [img]/ubbthreads/images/icons/smirk.gif[/img]

[bbdon]

I know that there is somtimes some confusion about the pump clearance setting. You need to set the accelerator pump lever to .015 clearance at wide open throttle. To do that you need to use something to push the accelerator pump lever down all the way while also opening the throttle all of the way. Then you use a feeler gauge to check the clearance with your third hand. The idea is that you don't want the the accelerator pump to bottom out at full throttle, which will harm it. Some people read the spec and set some clearance between the cam and lever at idle. You don't want to do that because the accelerator pump will not work soon enough, there should be no clearance at idle. This has probably already been set up for you, but I thought that I'd mention it.

[YENKO DEUCE REGISTRY]

Hey bbdon;
Thanks for the info, if it was set up for me - I have changed it several times already!! None of the other adjustments seemed to set up, so I just figured the acc. pump wasn't either. I will find my third hand and check it out, after I change the jets, examine the squirter, and ....
[img]/ubbthreads/images/icons/confused.gif[/img]

[YENKO DEUCE REGISTRY]

Had a little bit of time now that the NNN show is over to tinker with the Holley. Schoneye and COPO PETE were both helpful. I put the white pump cam in, made sure I had the '31' squirter, changed the secondary spring, rejet the primary's, and most importantly, rerouted the vacuum lines from the carb/dist. advance. That stupid TCS stuff was messing up the advance.

The hesitation is practically gone, but it still lacks the super strong midrange power it had before. So, the only thing I had before that I didn't re-install is the blocked power valve on the secondary side with '82' jets. They are on order, so I will install and retest, will let you know [img]/ubbthreads/images/icons/grin.gif[/img]

Thanks for the tips!