205 block?

hi all,
i'm still learning much about the pinto and have seen references to the "205 block" and i'm just curious what it is exactly.
i have tried googling for info which hasn't been forthcoming.
from the small bits of info i can put together from search results and forums it was a block made by cosworth for their sierra engines which had thicker walls. that's about all i know regarding it.
can anyone else give me further specs on it. perhaps enlighten me as to whether the 205 naming is meaningful too
much appreciated.
i'm still learning much about the pinto and have seen references to the "205 block" and i'm just curious what it is exactly.
i have tried googling for info which hasn't been forthcoming.
from the small bits of info i can put together from search results and forums it was a block made by cosworth for their sierra engines which had thicker walls. that's about all i know regarding it.
can anyone else give me further specs on it. perhaps enlighten me as to whether the 205 naming is meaningful too

much appreciated.