I called Blue Devil yesterday (July 4th) and left a message about my situation, Zach called me back early this morning & we discussed my situation again. He was very very helpful, turns out that I didn't need to remove a plug after all.
I was concerned that there might be radiator fluid in the oil so I drained the oil. Actually, I always wanted to try this, I siphoned 4qts of oil out from the dipstick. Know how long it takes to siphon 4qts of oil out of the dipstick? 2 1/2 days! I started Saturday. At least now I know. (With a better siphon I can get that down to hours.)
I weighed the gallon of oil on my bathroom scale. 1 gal motor oil weighs 6.8lbs, 1 gal water weighs 8.34lbs. My bathroom scale told me my gallon is 6.6lbs, close enough with a margin of error, I have no coolant in my oil.
Added 4qts Castrol Edge 10W-40. Added a bottle of Water Wetter to the coolant.
Started the car and idled it for another 50 minutes, this time never touching the throttle, letting the Blue Devil Head Gasket Sealer work properly on my head gasket near the firewall. The dashboard temp gauge stayed just below the L in NORMAL, never rising above it (I have the 180°F thermostat). I just turned the car off 15 minutes ago.
Results:
1. Top radiator hose no longer swells minutes after starting, and after 50min only the smallest amount of water is out of the tailpipes - so my leak to the #1 cylinder is just about fixed!
2. Car idles smooth, does not act like its misfiring anymore,
3. Very small drip of coolant on the garage floor,
4. Still some steam coming from the head gasket.
Now I have to let the car cool overnight and that's supposed to complete the repair as some BD product seeps into the gasket leak, and hardens as the temperature drops as it comes in contact with oxygen (BD with temperature differential in the presence of oxygen).
It's important to note that #1 fixed itself during the cooling down period, AFTER I shut the car down from it's first 50 minute BD run.
So far, it's a definite improvement!