Yes,you can.Replace them all.Make sure that they have oil all over them.then all you do is get motor to DTC and set the the lash following valve adjustment.
the main difference is a two stroke has oil mixed into the gas weather it is oil injected or pre mixed(adding oil to gas yourself). a two stroke has no intake or exhaust valves,no pushrods,or rockerarms. intake and exhaust into the combustion chamber in done through the sides of the cyllinder walls.
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
The pushrods in a 3.1L are different lengths. The intake pushrods are shorter than the exhaust pushrods. That's really half the story right there. You will need to know which valves are for intake and which are for exhaust. While looking at the head you will see the the valve springs assemblies are at differing heights. The ones that appear highest on the head are your intake valves, the ones appearing lowest are your exhaust valves. to be exact the intake pushrods are approx. 5 and 3/4 inches long, exhausts are 6 inches, on 3.1
valves,valve pushrods or lifters are the most common causes.
Is this for a 3.1 or 3100 V6? If so, the short push rods are for the intake valves.
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.
1. Overhead Camshaft: The camshaft (or camshafts depending on the design employed) is located above the valves within the cylinder head, and operates either indirectly or directly on the valves.2. Cam-in-block: The camshaft is located within the engine block, and operates directly on the valves, or indirectly via pushrods and rocker arms. Because they often require pushrods they are most often called pushrod engines.3. Camless: This layout uses no camshafts at all. Technologies such as solenoids are used to individually actuate the valves.
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.
Pigs
There is no valve adjustment on that engine. If you have noise coming from the valve train you probably have worn parts such as camshaft, lifters, pushrods, rocker arms and valves.
this is a mechanics job you have to remove inlet manifold,exhaust manifolds,and then remove heads to replace the valves
Repair or replace the oil pump, or replace the valves, if the oil pump is working properly.