68 GT350 Carburetor Plumbing

[Coralsnake]

The tilt hose looks correct.

You have the wrong thermostat housing

You should have a vacuum tree.

Your distributor vacuum advance should be a dual style, not the single type

[Coralsnake]

You need to study this page:

http://www.thecoralsnake.com/GT350a

If you can not use the choke tubes because of headers, you can cap those two lines. I have used a vacuum cap on the tube. You can use a brass cap to close off the threaded connection

Once you start changing things ie., headers, it becomes slippery slope

[CharlesTurner]

The choke 'chamber' on the exhaust manifold allows carb vacuum to pull hot air up into the thermostatic coil on the carb.  The thermostatic coil is how the choke/butterfly plate on the carb opens and closes.

With headers, it might be best to convert to a manual or electric choke.

[Corey Bowcutt]

Thank you Pete.  I have been to your site one million times but there are still pages I have not seen and this is one of them.  This answers all the questions but does bring up one more for me.  I have electronic ignition so is the vacuum advance even needed at this point?

If anyone has the correct thermostat housing or vacuum advance let me know.

Thank you so much Pete

[Corey Bowcutt]

Thank you Charles.  I do have the electric choke off the carb that is on the car now that if worst comes to worst I can use I presume.  But that is why I was thinking about wrapping the metal tube around one of the header tubes so it would continue to draw hot air.  But this was just a wild thought.

[Corey Bowcutt]

Two more questions occurred to me Pete.

1) does the cast iron thermostat housing with the tree work on the aluminum cobra intake manifold?

2) Do I need to have the hose going to the side of the carb that goes to this thermostat tree?  I currently do not have a fitting in the carb for the hose but I am sure I can get one somewhere.

Corey

[CharlesTurner]

Thank you Charles.  I do have the electric choke off the carb that is on the car now that if worst comes to worst I can use I presume.  But that is why I was thinking about wrapping the metal tube around one of the header tubes so it would continue to draw hot air.  But this was just a wild thought.

Without the vacuum draw, I don't believe the choke will work as designed... or at least be as effective, which will end up causing the carb to run rich.

[Chris Thauberger]

Posted this on another thread for Milo, thought you might like to have a look.

[Special Ed]

Chris in your photo the washer spacer goes on the inside of smog pump adjusting bracket bolt unless u have a/c then its not used.

[Coralsnake]

A small block is different and now we are off on a tangent...

The subject car is a 302.

[Chris Thauberger]

Thanks Ed. I think you or Bob might've mentioned that the first time around. I should explain this picture above and some other ones I posted on another thread were originally posted for all of you to critique before I installed the motor. There are more than likely a few errors in some of the photos.

Pete, sorry my bad I should've noticed that

[shelbydoug]

Posted this on another thread for Milo, thought you might like to have a look.

My 302 doesn't look like that? I like all the striped hoses but I must have screwed up?

[Krelboyne]

Posted this on another thread for Milo, thought you might like to have a look.

My 302 doesn't look like that? I like all the striped hoses but I must have screwed up?

No, they slipped in a GT-500 photo.   

[CharlesTurner]

Let's get us back on track here... 

Correct '68 GT350 4sp setup...

[Coralsnake]

Thank you Charles