sanding a cast iron block and heads

What do you think would be the best and easiest way to smooth out an engine block

 

There is really no easy way to do it. I use a variety of grinding wheels, from my 4" Makita down to 3M Roloc type discs, and I use cartridge rolls designed for head porting to get into the tighter areas. Basically, you want to get the surface as smooth as possible, as quickly as possible, without gouging it up. Once I get it smooth, I'll spray on a light coat of 2k primer, sand it, then base/clear.

 

slow hard work . makita 4" with sanding disc , drill with sandpaper tips , elbow grease ! ............... steve

 

Look at Langy's T thread, he is a pro at it.

 

I used a slab of really flat synthetic stone( free from counter maker shop), glued #80 sandpaper on and sanded and sanded a ( cast iron head).
So far, 1000 bi directional strokes and the 4 thousandths dip became a 2 thousandths low spot.
It is much faster (300 strokes with #150 paper) on aluminum.

 

Took me about 40 hours to do mine, with rotary files, stones, tapered paper rolls and flat discs.
Then Feather Fill and sanding. That was back in the 80's. Still looks good.