They wont be 180cc anymore when they are ported. So basically, depending on how much they are opened up will dictate there flow. Also the experiance of who is doing the port work. You wouldnt want me to do it.LOL. Ryan J, Brian Hafliger of IMM and many other guys on this forum could help you out alot.

10.53 @ 125mph. 1.37 60 foot. Caltracs and Monoleafs, AFCO shocks.

Heads by INDIO MOTOR MACHINE; IMM.
CP Pistons, PC Carbs.