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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: JJSZABO on January 29, 2007, 09:47:00 am

Title: Help with Engine
Post by: JJSZABO on January 29, 2007, 09:47:00 am

Hello,

I have a 1986 Chevy C-10 truck my son and I are redoing as a daily driver.  It originally had a v6 but I bought it with a 350 in it.  I have had great help from the folks in the Body forum but now I need your help.  Could you tell me what this is:



Here is what I am trying to do.  I am getting rid of the electronic spark control and going with a HEI distributor with vacuum advance.  But since the ESC controlled the distributor advance I don't know where to hook the vacuum line for the new distributor to the carburetor (it is the original M4MED rochester carb 4bl).  I am assuming it has somethig to do with the picture.  Can someone help?

Thanking you in advance.

Jeff

Edited by: JJSZABO at: 1/29/07 9:48 am

Title: Re: Help with Engine
Post by: roundedline on January 29, 2007, 11:20:00 am

Quick answer, find a ported vacuum source on the carb and hook it up there.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

Title: Re: Help with Engine
Post by: JJSZABO on January 29, 2007, 12:03:00 pm

Thanks Chris, that answered my question.  Can you tell me what the device on the firewall is?  It has a vacuum line attached on the right side that connects to the carburetor.

Thanks again.

Jeff

Title: Re: Help with Engine
Post by: DnStClr on February 03, 2007, 02:37:00 pm

It looks like the tip in vacuum switch.
Here's some info-
www.73-87.com/7387garage/drivetrain/escrepl.htm

Don St.Clair
Culleoka Tn

Title: low vacuum switch
Post by: VileZambonie on February 03, 2007, 11:14:00 pm

The low vacuum switch unlocks the TCC solenoid

Title: Re: low vacuum switch
Post by: DnStClr on February 04, 2007, 08:16:00 pm

Well, I had the vacuum switch part right anyway.  

Don St.Clair
Culleoka Tn