Resurrecting an old thread and high-jacking it!

Tonight i did a compression test on my stock F54 block with a P79 head. I tested with a stone cold motor, disconnected the EFI from the fusible link, unplugged the coil from the distributor and did each cylinder one at a time 3x both wet and dry, with the other spark plugs still in. These are the "average" results i got from a 180,XXX mile motor;


WTF is going on with cylinder 6?!?!

I did a comp test in hopes of finding out if my head gasket was blown. Just recently, the past 2 days, the car has been expelling out clouds of white from the exhaust at idle and with load.
I was like :eek: :012: :022: and:078:when i saw the smoke.
First i thought maybe its from a bad cat converter and the many quarter and nickel size holes that are in the exhaust piping. Then i thought maybe its condensation or trapped rain water is what im burning off in the exhaust??? but i havent driven in the rain or crossed any water puddles lately...and now an unusually high compression test reading in the 200's?!?!
The past week i have been losing a qt of coolant ever other day, sometimes a little more depended how much i drove that day. i figured the cause was from a damaged and leaky radiator drain tap...but NOPE!
Since the steady lost of coolant i have been noticing gunky and dried up coolant leak trails coming from the thermostat housing and right by cylinder 6, at the corner where the head meets the block.

Which brings me back to my 1st question, "WTF is going on with cylinder 6?"

I know i may have some valve(s) or lifter(s) issues, due to the loud metal on metal tapping from the valve cover, which has gotten louder since ive had the car(5 months but only has been on the road for 2 months). im pretty sure the motor has never been fully maintained and still has original engine gaskets..so before i invest in either a new exhaust system or do a full engine gasket replacement. i would like to hear any comments or ideas that anyone has to offer.

My PSI was 120 on cylinders 1,2,3,5,6 and 4 was only 90. That and the BS vacuum chop job led to my rebuild.