I'm claying my domed pistons for clearance and wondered if it is common practise to cover the whole dome in clay or different points of the dome. The last time i did this was with my old six pack pistons when i fitted my 76cc eddy heads, so not much clay was needed to fill the valve reliefs.
This time i may have got a little heavy handed with the clay and couldn't compress it, so i've taken the heads off again and i'm going to roll it a out thinner and try again.
Mick