Hi John,
For those that haven't met John yet, he owns one of the nicest 1800S's you'll ever see (because he actually drives it). His car is the dark red one third from the right.

Anyway - Greg's got it nailed down. I did grind the B20 block as you can see here on the right. It took me a couple of evenings with various stones, carbide burrs, flap wheels, hand blocking...it got a little out of hand.

Then I hosed it off with metal prep as POR-15 doesn't stick to smooth surfaces. Then a single coat of regular old POR-15 (black) sprayed with a cheapo touch up gun. Then when it is tacky (about 3 hours or so), you hit it with 2 coats of POR Engine enamel (let the first coat fully dry 24 hours).
This is the result.

I've also used this same process to do my B23E - it turned out fine albeit not as nice as the polished block in the 122.
