i just rebuilt a 580.7 ,had to go 1.5mm over for a clean bore.hot rod crank,pro x pistons,came out pretty nice,tested 180 psi in both cyl's (although i dont know how true my guage is).i belive its fairly close.

so 2 questions for you guys,1st 180 seems a bit to high or is that a normal good number for a 580.7?

2nd being 1.5mm over brings the engine to about 602cc,how much more fuel might i need?should i rejet or would a screw adjustment do it?

thanks in advance.