thanks for reply.
I want to use this pistons for rebuild:

COSWORTH YB WISECO PISTONS 91.5 mm (BORE SIZE)
COMPRESSION HEIGHT 40.87mm
BOWL VOLUME 20.2cc :
COMPRESSION RATIO 8 : 1

I think dimension of this piston totally the same with 4wd mahle pistons. So, seems 40.87 pin to piston top height at std mahle piston...
But I am sure, piston is not lower down the bore, it above the block is around 0.5mm(not sure) at std YB engine. If I will use 1.3mm gasket(YB0611 Gr.A), seems 0.8mm piston top to head face... But not sure, need PF members help and confirmation. ))
Because I need to get CR 8 : 1. Will use 2wd head 138.4mm thickness.