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I think they are not removable from the top, and the cam must be removed to pull them from the bottom. They (if I recall correctly)are mushroom lifters more or less "T" shaped. I would open the bottom end and look at it. What you will find is a rusty lifter in its bore. From the top looking into the push rod hole (though you won't see much) you will be able to see where to put PB Blaster or other penetrating fluid. Turn the engine till the lobe on that lifter is down, away from lifter.
Use a nice piece of 5/16 mild steel rod with a ball shape ground into one end. Place this in the pushrod hole in the resess in the lifter, and mark the rod with tape just where it goes into the head. Tap gently using a small ball peen. If it moves any at all (probably), go below and use a piece of 1/2" birch dowel rod to tap it back up (do not whack hard in the up direction the lifter "mushroom" can crack off, then you are into a cam removal!!). If it moves continue (up down, up down) till it is free and loose. Then oil it with engine oil cut 50/50 with gasoline. The rusty stuff will drip out the bottom.
Do this till the rust stops comming out (might be five minutes, might be an hour). Rust is Iron Oxide a very nice abrasive, so it is important to remove. If it does not move, use a propane torch to heat the casting in the area of the bore from below, and tap more. A propane torch will not have the heat capacity to over heat the system if used for 10 minutes or so.
if there is rust on the cam lobe polish it, and the lifter contact area with 400 grit silicon carbide paper.
Spray it clean with brake clean, and relube with lubriplate engine assembly grease on the contact surfaces, and straight engine oil down from the top. Good luck. I got help on this engine from this forum little more than a year ago. The issue was identical (we thought the head or pushrods, or cam, or rockers or valve job were causing geometry problems. It was 6 stuck lifters.
Good tapping. (never tap on the lifter with the cam lobe up!!!).
JimN
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