Anyone know how big you can bore these Prox / IQ 440's and what pistons would you use? Currently its stock w/ a 66mm bore.

Thanks

TTT - Anyone?

with such a short stroke, not allot of cubes could be gained. I think 500c would be about max. I think the 500 and 600 jugs will bolt on, but the cases would have to be opened up for the pistons, and the engine would be majorly over-square.