Thanks, what does that offset make the capacity?
Mine is fitted with Calver 72.5 mm pistons to give 1342cc. As Cooperman says it not so much about the capacity, what you're looking for (hopefully) is the component parts making a great result. Its no good just increasing the capacity if you don't work out what the compression is going to be and you don't want to work that out until you know what sort of head you're going to fit with what size combustion chambers and what cam you're going to run.
As we've said before you will find it very beneficial to talk to a good engine builder about what you want the engine to do rather than just list a specification of parts. There are several good engine builders on here and some who aren't. As I have said before speak to someone like Keith Calver about your requirements. I run one of his cams and it gives 83 lbs of torque from 2,750 revs all the way through to 7,000 revs and beyond, the pulling power is incredible. This is far more beneficial than going for a specific capacity.
(edit: the torque figure is at the wheels)
Edited by Northernpower, 19 April 2017 - 06:37 PM.