i have a question about piston size choice for my YB block my block is still on its standard bore and i know a std bore is 90.82mm but it's in for a rebuild so i want to give it the lightest overbore i can so a .25 i hope will do me so my question is in the link below there a wossner pistons for sale and all sizes available am i right in thinking a 90mm piston is std size and the 90.25 is the size im after but i was also told that high performance pistons has a tighter clearance than standard so what size do i need

http://www.ebay.co.uk/itm/WOSSNER-FO...item20b69dd86a