Chevy 250 vacuums lines

[CJ6er]

Hi. I'm in the middle of put a L6 250 into my 70 Chevy 4x4. I'm not sure where all the vacuum line go and what some is the parts are for ?
Here are the pictures of what u have
The first pic is a long steel vac line. Not sure where it goes
Second pic is a vac Tee with long hose on it and had a short one off the tee that was plugged
Third pic is a tee off of the valve cover vent that goes into the manifold. Where does the tee go ?
Forth pic. Not sure what that does ? Do vacuum lines attach to that ?
Thanks

[SnowGecko]

I'm guessing your talking about the order of...
12
34

The first pic is a long steel vac line. Not sure where it goes
looks to be a line to the auto trans vacuum line, or possibly a trans coolant line that should go to the rad. aut trans need vacuum to help shift IIRC...
Second pic is a vac Tee with long hose on it and had a short one off the tee that was plugged
it's possible that it's for the vacuum advance on the distributor
Third pic is a tee off of the valve cover vent that goes into the manifold. Where does the tee go ?
usually a valve cover line goes to a manifold vacuum port,
to create the right pressure in the crank case
Forth pic. Not sure what that does ? Do vacuum lines attach to that ?
Thanks
there are 2... the one on the left looks to be an oil pressure sensor, the right side looks it could be a water or oil temp... but definitely a temp sensor

[Steeveedee]

There should be a 3/8" vacuum line from the valve cover to the carburetor, probably at the base, for Positive Crankcase Ventilation (PCV). There would be another large (5/8") hose from another location on the valve cover that goes to the side of the air cleaner housing (where there is a filter for the other end of that PCV system).

If you have an automatic transmission, one steel tube would extend from the intake manifold to the transmission vacuum modulator, with a small piece of hose at each end.

The valve in the side of the head would be for the Transmission Controlled Spark (TCS) system used in these years of trucks. The TCS system limited vacuum advance until the engine was sufficiently warmed up, and in high gear (3rd with an automatic).

['68OrangeSunshine]

1] IDK. OEM Fuel Line, 5/16'' maybe? See if it runs from fuel pump, around the head to carb.
2] Upper center screen -- Carb vacuum line coiled, to go to vac can on alternator.
[Replace it, as rats have chewed on it.]
Lower screen left is a broken off electric water temp probe.
3] Looks SMOG-related, A.I.R. system. Delete for performance.
4] Left of the dipstick is the oil pressure idiot light sensor. Right of the dipstick is a cut-
off mechanical oil pressure gauge line.

[CJ6er]

Thanks for all the replies
So I'm running a 4 speed manual so I'm assuming I don't need to hook vacuum lines to the TCS ?? Just cap them ?
I have the 5/8 line from the valve cover to the air cleaner and the 3/8 line from valve cover to the manifold but it has a tee ? So should I just cap it the tee ?
Then just run one line of the bottom of the carb to the distributor and one to the vacuum pot that is connected to the heat riser damper ?
Thanks