Under the valve cover, of an overhead valve engine.
They push the rockers on the opposite side of the valve stems.
Overhead Cam engines do not have push rods.
The 3.0 liter " Vulcan " V6 engine is an over head valve / PUSHROD design ( The 3.0 liter " Duratec " V6 engine is a Dual Over Head Cam design so it doesn't have pushrods )
Nothing. They are all the same length
no
You should have labeled them and installed them in the exact same position as they were in. If you did not, then, all you can do now is guess.
It should be a constant flow as long as the oil pump is turning.
There are a total of 12 pushrods on a GM 3.1 V6 engine from 94 through 2005. 6 are 5 & 3/8 the other 6 are 5 inches. They are for intake and exhaust pushrods. The best way is to install them and place them back where you took them off but if you didn't you will have to install them back and observe that the pushrods that are in a slight angle are the long ones. The short ones are straight down. You should always place your lifters, pushrods and valves where you took them off but I know that many people make mistakes since we are humans. Also look at your cylinder heads and see where the intake and exhaust valves are.
They will have to be measured and cross referenced by the engine specifications. There is no other way to know what goes where.
The exhaust pushrods are slightly longer than the intakes. To locate where to put the shorter intake pushrods look in the bores in the cylinder heads where the intake manifold lines up and you'll see the intake valve. Simply place all the short pushrods where you see the intake valves and you should be able to find where to install the rest.
The piston(s), the valves, the pushrods, and the rocker arms in an overhead-valve configuration all go up and down proportionally to the engine's turning speed.
Well...kind of. There's a recess in the cam follower (which is way inside your engine) that accepts one end of the pushrod and a recess in the rocker that accepts the other end. Pushrods are the same at both ends. So... Start by rolling the pushrod on a flat surface. If it won't roll, it's bent and you need a new one. Stick the pushrods into their holes, then install and torque the rocker arm. Adjust your valves, install the valve cover and you're done.
They are all the same length. It is not necessary to put them back in the same spot.
the intake pushrods are shorter of the 2, all intake valves you can see with the intake off those pushrods go there, the rest are exhaust pushrods install in remaining holes