yoshi06

so i have a 91 ef hatch and it has a d15b1 bottem end i have a z6 head and everything needed for the swap i realized when i took the head off it had a y7 head it had pm3 pistons (the d15b7 pistons) so i want to do a bottem end rebuild with vitara high comp pm7 pistons from the zc will they fit or do i have to bore it out ? another question is im not sure if they just changed the piston or rods or crank how can i find out
thanks
__________________