Good Evening Everyone, have not posted here in a while. I have a 1965 Volvo 122s withy a 1974 B20, fuel injected head with weber carb. Just completed a rebuild with new bearings, piston rings, etc. Reason for rebuild is due to no compression on number 3 cylinder. Prior to rebuild, I tried a carbureted cylinder head just to make sure it was not the FI Cylinder head. Same issue, no compression on number 3 cylinder. So I went ahead and did the rebuild. Put everything back together and I'm back to same issue, no compression on number 3 cylinder. I cannot figure out what the issue is. Put air through the sparkplug holes and it will move the crank on all cylinders, but when I do a compression test, nothing. I just can't think that both cylinder heads will have the valve's bent or similar issue. I tested the carbureted cylinder head by putting water on the intake/exhaust port holes and the valves appear tight as nothing is leaking. Not sure if the FI cylinder head may have a bent valve, but as I said earlier, I would not think both cylinder heads will have the same bent valve or similar issue. If anyone has any ideas, please post here. Thank you so much.

1965 122s
1991 740T SE with cracked back glass - looking for one