And since my block is getting rebored I've treated it to some Autosprint 'flat-top' 87mm pistons with larger valve cutouts should I ever want high lift cams:
http://iainel.co.uk/images/forums/NovaWIP2/834.JPG
http://iainel.co.uk/images/forums/NovaWIP2/835.JPG
http://iainel.co.uk/images/forums/NovaWIP2/836.JPG