done that going by the site i put the piston 3mm down from deck height to top of the dome on the piston bit o plastic n grease filled it up it took 26ml to fill. head is 47cc n i put in a gasket thickness of 1.5mm to save skimming the pistons but looks like i will have to take a couple of mm off them was just wondering if anyone has got away with firing in pistons off the shelf n that was that