4bbl holley on 350 sbc/ leaking from top rail of carb

Are you saying I should replace gaskets and torque down in that sequence?

 

No, just tighten them for now. Then check around the ports for a leak while it is running. Carb spray. See if any kind of bubbling happens. Check your carb base nuts as well.

 

Yes thats what I did monday night and its still the same.

 

Is that a spreadbore intake? Or just a square bore type.
That fancy pcv with the hose to the carb might be a vacuum leak too!

 

It must fit snugly, like all the vacuum lines. Is the modulator connection tight? We should make a check list and thoroughly go down it, one by one...I went through the same drill when 1st getting my Impala back on the road. The same vac/carb issues.

 

Ok I guess we can make a check list then.

 

Alright guys whats the check list you made for me?

 

For the morning crew! So where should I start off on this situation to solve the "vacuum leak"

 

Patience gr***hopper!!
We'll let slammed give you a list!!

 

Ok I will try. Ill wait for his list.

 

Been super busy and hopefully can make some head way on the car this weekend. Got to get a list made and get the bugs worked out. Anyone?

 

Have you set the float levels correctly?

 

Yes I have. rock the car and a little fuel comes out of each bowl.

 

Good! Floats are set.
Have you had the carb off the intake?

 

Yes I have, I replaced all the gaskets along with the base gasket.

 

Have you checked the timing since you have hooked up the vacuum advance? I looked and didn't really see if you found out if the vacuum canister is shot.

 

What type of intake?
Did it look like in this link?
THis is a spreadbore style.
http://www.holley.com/8125C.asp

Or was it like this one?
A squarebore intake.
http://www.hawkinsspeedshop.com/yea...er-dual-plane-aluminum-natural-square-bo.html


I'm Just trying to eliminate a vacuum leak source.

 

No if I can remember right it was completely open and wasn't divided

 

Was there one gasket or 2 gaskets with a thin plate between the carb and intake?
What is the name on the intake?
Do you have a pic of the old gasket you took out?

 

Im pretty sure its called "Street Dominator" There is no plate between carb and intake just a gasket, I do not have a picture of the old gasket.

 

I googled your intake. It's a spreadbore type. You need a thin spreadbore to squarebore adaptor like this one in the link from edelbrock. Part #2732
It's for edelbrock carbs but should work for you. It consists of 2 gaskets and a 1/16 inch plate. This could very well be your vacuum leak.
http://www.edelbrock.com/automotive_new/mc/install_items/adapters_spacers.shtml

Available from summit for 7 bucks.
http://www.summitracing.com/parts/SUM-G1420/?rtype=10

 

That intake came both ways, this one is a spread bore type with a spread bore Holley on it



same intake but square bore with an Edelbrock on it

 

I stand corrected!
Lift up your carb and check first.

 

Im not saying any one of you are wrong but it would really need that adapter?

 

If he had a square bore carb on a spread bore manifold, sure he would. The square bore is not big enough to cover the spread bore's hole. If you try it the other way, spread bore carb on a square bore intake, the secondary throttle plate can't open because the manifold hole is to small.

 

Ok here is my intake, do I need that plate with the intake/carb set up I have?

 

Yes! Most definetly!
That's the spread bore style intake.

 

So I am definitely gonna have to buy that plate kit then? I was checking Autozone and Oreilly so I could get them local but im not seeing them

 

Yup you'll need the adaptor. You must have some speed shops in your area besides the parts stores.
Let us know when you get it ready to install and we'll give some tips on carb installation. Then we'll get you fixed up on your vacuum pot on your distributor and your timing and carb tuning.
Do you have a vacuum gauge and a timing light?

 

I have searched for some local speed shops and nothing comes up. I don't have a vacuum gauge or timing light either unfortunately.