> For extremely difficult and time-consuming values of 'easy'.* Where does
> the sand come from and what does it do?* We've been driving old cars
> (1968-70) for a long time and if we have sand we sure don't know it!

This is a good video on engine block mfg:

https://www.youtube.com/watch?v=211Xkut0VGI

It looks like Goggle/youtube has found a way past all my ad blockers and
user agents. Hit Refresh one or more times to get past the ads.