Yeh the pre-treatment you mention is just shot blasting. I would seriously doubt anywhere wont do this. That post on the other topic is generally mince for want of a better term.
Be very careful when you get your rocker cover done, that all the shot is cleaned out of the inside before you re-fit it. I have seen an engine killed due to shot rummaging around the engine
Be very careful when you get your rocker cover done, that all the shot is cleaned out of the inside before you re-fit it. I have seen an engine killed due to shot rummaging around the engine