If I was to build a mild road going L28 and needed new pistons, what are my options? If I also need to bore the block anyway then what's the biggest size you can take the block out to and still get cast pistons? If I was going to take it out to 87.5mm or above then what's the cheapest forged piston option? At the moment I'm just considering the most economical way of putting an engine together out of the parts I have to make it usable and a reasonable upgrade to a standard L28. I have a L28 block that's at 87.5mm by the way. As far as I can see the big value parts are the pistons.