Remove the head and and turn over the engine. Watch the valves that DO move to see when a cylinder with a stuck valve is at TDC. At that point both valves should be closed so youll have plenty of room between the stuck valve and its lifter to try and close it.
Spray some penetrating oil onto the exposed valve stem and guide, place a brass or hardwood dowel directly on the center of the valve and LIGHTLY tap it with a hammer. Start out with tiny blows and increase them ever-so-slightly until you get the valve to move. As the valve closes, keep spraying penetrant on the stem so it lubes the guide as long as you can reach it, and be sure you hit the valve squarely- any side force may snap the valve head off of its stem.
Hopefully, the valves arent stuck too bad and they readily slide in the guides and seat against the block. Roll the engine over until that cylinder is once again at TDC (or its companion valve is fully open) and repeat the procedure until all the valves operate smoothly.
It takes a while, depending on how many valves are stuck and how good your penetrant oil and swinging arm are. Dont hit them harder than you would if you were driving a small nail into a pine block. If they wont move then, youre probably gonna have to pull the block out, unless you can access the lifter galley and pull the retainers and springs out.
If they were used on your engine, and your exhaust valves were the ones that are stuck open, I would remove that galley access plate anyway to make sure you dont have any missing valve rotator cups on the exhaust valve stems. They just fit over the end of the valve stem and are held in place against the lifter by the spring tension pushing the valve down and against the lifter. If the valve sticks in the upward position, when the cam turns and the lifter drops, that rotator can fall out if there is enough clearance between the two parts, especially if someone is hammering on the other end of the valve! If you do have them and some are missing, they are either in the crud on the galley floor, or they are safely stuck in the goo in the bottom of the oil pan.
Missing exhaust rotators will give you an extra .040''+ clearance in your valvetrain that even SAE 70 wont muffle!
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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