Who Builds FORD Nascar Engines?

[XCSEDAN]

Hey
i was a little unsure where to post this, in the pits or here or an engine section.
i figured here as it would see the most traffic (hopefully that's ok?)

I was wonder who makes the FORD Nascar Engines, i know Arrington make a the R5P7 Race Engine but thats a Chrysler engine....
i'm pretty sure Roush makes them, but i can't find a site that lets you look at their actual race engines.... (unlike Arrington who actually sell them!!!)

does anyone have any info on who makes the Ford Nascar Engines???

Cheers