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I poked the ones I was able to open and nothing else came out. I ran both engines with AF cycling through and probably used 8 gal each engine. I can't get 2 of the plugs out and I'm running out of time. I think at this point my best bet is to pour some AF back in through the hoses. **Update...

I just winterized yesterday on my new-to-me 280 with twin 5.7s. Couldn't get 2 of the lower plugs out to drain it. I ran AF through the each block for a while but now I'm a little concerned about what might be lying in the bottom. I was able to get 1 of the lower plugs off each block and...