I'm not entirely sure, didn't mic the cylinders while I had it apart, so don't know if it's been bored. Googling the numbers on the cam wasn't a lot of help, but it looks like it may be .440 lift. Definitely timing gears/chain upgrade, and heavy duty valve springs. My buddy with tons of experience says it was definitely rebuilt, and his guess based on the condition of internals suggests very little run time on the rebuild. Likely less than 10 hours.
