afaik RevUp and HiRev are terms used to describe the same engine... this one lol. RevUp is the official name from Nissan, and this has been verified to be a RevUp block, which according to Nissan makes 306hp at the crank.
ty for the bumps and love.
i was referring to HR as in the 07-08 dual intake motor. lol bumppp be a nice swap for a 240