P&T

        If you have enough of the bolt drilled out you might be able to use a
sharp hard ScratchAll like tool

at an angle around the edge where the bolt meets the block & with a
hammer try to collapse the remains

of the bolt inwards ~ I have done that sort of scenario in the past
with good results.

                                                        ORR ~ DeanB

On 19 Aug , 2012, at 10:23 AM, Paul wrote:

> As luck would have it the two 8mm, I think, bolts that are on the
> opposite
> side of the temp sensors in the thermostat housing sheared off due
> to being
> seized in the holes due to lack of maintenance on my part. Anyhow I've
> managed to drill them out to the point where I don't want to use a
> larger
> drill bit and risk screwing up the threads. In fact in one of the
> bolts I
> tried using an extractor type bit that broke off in the bolt too.
> Any sage
> advice would be greatly appreciated. These are the last two stumbling
> blocks, that I'm aware of now, standing in the way of me getting my
> engine
> back in the van so we can go camping................
> Help,
> Paul in Tracy