[Bellerophon]

This sounds like the gaskets which can be obtained from the German BMW
club, they are of good quality, however, on their 328 engines they do not have
a small hole near the rear of the block as the later Bristol engines do. I
have one of these gaskets in my engine which I modified first by putting in
the hole, and am pleased to say that I have had no problem for several
years of running with it.
It is becoming more difficult to source good parts for our engines so one
has to take the best which is available even if it requires a little
modification, after all we need to keep the cars on the road.
My regards,
Bellerophon