78 345 holly vac hook up

jeff campbell

Active member
I have a '78 s II,345,and like to know what port the dizzy vaccum advance is to be hooked to., also the decal mod valve, where it's supposed to be hooked to, thanks--tia Jeff
 

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The dist. Line goes to a port on the bottom front of the carb. Right between your idle screws. I'm not sure what a "decal mod valve" is. Mine is a 79 304 but I would imagine the vac. Lines are the same.

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Thanks andy, 1st pic is the decal mod valve...in front of the throttle shaft...Jeff
 

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Last edited:
Thx all for reply's andy & jason ! I had my power booster hooked into the intake manifold, an it shuda been hooked to the carb, but the help of a member that sent me his diagram cured this after the 11 th time I looked at it....thank you very much....it did make a difference as well. Runs good now( but that's how it was hooked up when I got it , to the int.,manifold) guess that's how I got the truck so cheap ? Lol, o well, live an learn I guess....) .,...Jeff
 
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