[Linez35]

can someone please give me a picture or a guide of all the vacuum hoses on and 80,s truck with a 350? its just a basic truck without a/c and stuff. thank you

[DoubleVision]

Just saying "80's 350" Isn't of much help, as the later years arrived they went from carbs to TBI. However, it's not deadly important where they connect. The ports above the throttle blades are manifold full time vacuum that pull vacuum at idle. The ports above the throttle blades are ported vacuum they only pull vacuum off idle. The PCV goes to the largest manifold port. If the trans is a automatic and uses a modulator valve this connected to the fitting on the intake manifold itself. The line going into the firewall that controls the vent function connects to a manifold source. The line going to the vacuum advance goes to a manifold vacuum source. The brake booster goes to the rear of the carb on the very bottom. EGR should be connected to a ported vacuum source. Now if it's a TBI it's a little different.

[Linez35]

Originally Posted by DoubleVision

Just saying "80's 350" Isn't of much help, as the later years arrived they went from carbs to TBI. However, it's not deadly important where they connect. The ports above the throttle blades are manifold full time vacuum that pull vacuum at idle. The ports above the throttle blades are ported vacuum they only pull vacuum off idle. The PCV goes to the largest manifold port. If the trans is a automatic and uses a modulator valve this connected to the fitting on the intake manifold itself. The line going into the firewall that controls the vent function connects to a manifold source. The line going to the vacuum advance goes to a manifold vacuum source. The brake booster goes to the rear of the carb on the very bottom. EGR should be connected to a ported vacuum source. Now if it's a TBI it's a little different.

thank you for your help