Here are some of the big boys just off the top of my head: Chris Charming, Ron Jeremy, Julian Rios, Mark Ashley, Ben English, Lee Stone, Evan Stone.
So who do you think the biggest white cock in porn belongs to? And how big is it? Most of the guys I listed are probably around 9". I think I've yet to see a legit white 10 incher. Are there any?
Ron Jeremy is full of bull.
These are the guys that work in straight porn so there could be bigger guys that do gay porn.
Also the guys you listed are probably under 9". Lex Steele is really 9"5 as he was measured in a scene he did and he is bigger than those guys.
The biggest guy in porn is Mandingo at 11"5.