Tom,
He can look big sometimes, depending on angles and who he's with, but if you watch him in group videos with a bunch of other guys, he looks to be in the 7 range (possibly 7.5?). While it sounds cliche now bringing it up, he's small and trim which adds some to the visual. I'm pretty sure either a James Deen thread here, or the "Measured Porn Stars" thread already has estimates (lower than mine IIRC).
On a side note- When I first started watching this guy, I swear I remember reading an interview where he claimed to be "only eight inches", but it looked big on him or people tended to overestimate him or something.
Take Care
Crunch