That I do not know. He just called me yesterday about it. I told him probably try to keep it around 7000 so I was close. I will try ti find out what bolts are in it. Do you know of any pistons for sale ? I think this guy has the block,crank,and rods only. I told him not to offer too much because i've seen assembled ones from Nye's for 2700 something on here. Thanks for the reply David.