Thanks guys for all that info am trying the soak method now the piston is at the bottom of its stroke and the fluid runs into the crank through the intake but we will persist for a while. The motor has not run since sometime in the 1960's I an told so it hasn't run for 50 years.
Yes it was on Gumtree as part of a deceased estate - guess I was lucky to be in the right state on this occasion and only 15k from the seller.
Took the cover off to satisfy your curiosity Jack this is what I found.

[Linked Image]
Thanks again


If it don't go its not good.