TH350 Vacuum Hose Hookup

[John1aus]

Hi Everyone,

I Have a 72 C10 that was originally a 6 cylinder. I bought a 77 C10 with a 350/TH350 and swapped that combo into my 72. I noticed the TH350 has a spot to hook up a vacuum line. I have read a few threads on this, and plan to buy a brake line and put hose on each end.

I put an aftermarket Weiand intake and Holley 4 barrel carb on the 350. I have read threads that say to hook this up to the intake vacuum port. However, my brake vacuum line is hooked up to that. Some threads also say not to splice that because it should be for brakes only.

My question is should i hook the line up to a port on the carburetor? Any info will be greatly appreciated.

Thanks!

[geezer#99]

Any full time manifold vacuum source will do.
Should have one or two available on your carb.
Or maybe a vacuum tree on the intake.
A pic of your intake/carb would help.

[FirstOwner69]

Here's a picture that shows the vacuum tree at the upper right corner of the pic on my 69 . There are 3 ports, but only 2 are clearly visible. The third, to the transmission, is on the opposite side of the bottom fitting. Power brakes were added by the dealer as a condition of original sale when the truck was new. I'm not sure this resembles how the factory did it. This setup provides a vacuum source for the brakes, A/C and transmission (TH400). Here's a link to the fittings sold by Corvette Central.

https://www.corvettecentral.com/sear...tting&count=18