I had problems with this also. I even have the Helms manual and the plug
shown in the book did not match reality. I found a plug/bolt in the general
vicinity, but it definitely did not match the diagram. I started taking it
out (it was hard to loosen), but it didn't feel right. It was very stiff
even after I had it most of the way out. Since I didn't know what behind
it, I ended up tightening it back up and just flushing with a hose by
draining at the radiator, filling it up, running until hot, and repeating a
couple times. If I were doing this again, I would flush with distilled
water instead of the hose. It would only take a 2-3 gallons and I would not
have introduced calcium laden water into the system.

I remember being very frustrated that the Helms manual was wrong. What
would have taken less than an hour if I could have drained the engine block
instead took me over two hours.

Sid

"Ed Overly" <edoverly@yahoo.com> wrote in message
news:ff5a2953.0311281450.53ac3778@posting.google.c om...
> Can anyone tell me where this is? I thought it was below the oil
> filter on the back of the block, but I can't find it. Thanks.
>
> Ed