I've covered Valentine's explosion and quickness here, as the 6'3 5/8, 329 lbs Valentine offers the best broad jump and 2nd best shuttle time of any 325+ lbs defensive tackle over the past decade.
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Here's a video of Valentine cranking out a 745 lbs squat, which is absolutely insane. For comparison, Vince Wilfork apparently had a max squat of 505 lbs when he was coming out of college. Valentine is able to squat 50% more.
According to the Patriots weight room records from 2013 courtesy of NESN's Doug Kyed, a 745 lbs squat would set the team record, surpassing offensive lineman Joe Andruzzi's squat of 725 lbs. The team record for a defensive lineman is 685 lbs from Ethan Kelley.