How come most modern FE alum castings have the Extra Texture Finish?

[ScotiaFE]

Nice Howie im impressed

Thanks.

[ScotiaFE]

Howie was that off Dave Gingery's plans?

Not from his plan, but he did make some really kool stuff.
I started a double pipe lathe a long time ago.
It's pretty close to actually working. I should finish it before I'm gone. 
Dust collectors.

[falcongeorge]

...Don't dimpled finishes also make the car go faster to because the course finish cuts through the air like a golf ball. (even under the hood).