doing a 3800sc swap, any suggestions for vacuum routing? eliminate "tee" on top of housing? where do all the lines run to?

All that is ever left on mine is the brake booster line off the TB, And from under the SC snout go to the MAP, and Tee to the FB regulator.

I agree with mike. Run a line to booster from throttle body. Fuel pressure regulator and Map off same line. Make sure you block off the vacuum tree on supercharger well, don't want a vacuum leak.

thanks guys!

i get all kinds of conflicting advice here about the vacuum routing on the 3800 SC - L67. My car is all stock manual transmission with all sensors. The advice doesn't agree. Here are two differing diagrams:

screen capture



and from another thread:



And then another guy says i need to use the hard plastic lines rather than rubber hose.

What should i believe?

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I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun!