broken adaptor pump to manifold

[jeff m <jmackd1@yahoo.com>]

Hello, while trying to take off the adaptor
pump-manifold ( it sits opposite of the water temp
sensor under the t-stat housing) i broke the head off
and now i can't get the rest of it out. I tried using
EZ-outs but it's not doing it. I think I will just
have to drill it out but am worried about screwing up
the threads in the housing. Anyone else had a similar
problem and if so, what procedure did you use to
extract the rest of the bolt out?

As always, thanks for any advice!
Jeff
'75 TR6