[69galaxie500]

New holley 600vac.secondary, no vacuum leaks on a stock 390. I changed the dizzy from 15l to 10l under the point plate? When I step on the gas in gear she just sucks air and treis to die. Could this be fron not enough total timing? Initail is set at 10 with 20 mech. and 10 ported vacuum ( I believe ), I wonder if the initail needs to be bumped up? Thanks for any help.

I switched the carb out to anouther new holley, returning the old as damaged. Put it on, set the choke, air mix and she lays down rubber, like she never did before. Thanks to all for your advice.

<font size=-1>[ This Message was edited by: 69galaxie500 on 3/7/06 10:49am ]</font>

 

[FEandGoingBroke]

Naaaah, it sounds like you need to adjust the accelerator pump for a heavier shot when pressing the throttle.... That should take out the stumble.

FE

 

[mustangboy]

My advice is to try it and see.All you have to do is loosen one bolt and give the dizzy a little turn and then you'll know for sure.Why did you change the mechanical advance from 15 to 10?

 

[69galaxie500]

Well, when I was playing with the 2v carb she responded well to 16 initial and with the mechanicle set at 15l that's 46 advance. I couldn't get the vacuum down low enough to get rid of pinging at high rpm. My new set up will allow me to go 16 ini. for 36 total and vacuum set for 4-6 advance. Sound right? Please correct me if I'm wrong.

 

[69galaxie500]

On 2006-03-05 21:22, FEandGoingBroke wrote:
Naaaah, it sounds like you need to adjust the accelerator pump for a heavier shot when pressing the throttle.... That should take out the stumble.

FE

When I start to move the throttle linkage I get a pretty good squirt, I would say some where around 1/8in. stream. Maybe it's the cam needing more squirt time.

 

[FEandGoingBroke]

That is another possibility, but if it were me I'd tinker with the timing issue until I got the best NON pinging performance out of it, the stream you mentioned above sounds about right.

FE

 

[ujt389]

the advance sounds good, to me it sounds like a carb issue.