SOHC Pistons in a DOHC

[dwada]

I remeber seeing a post on a forum that if you use the SOHC pistons in a DOHC motor you had to have valve relifes cut into the pistons. Does anyone know or remeber how much of a valve relif I should cut into the piston? This is for the SOHC pistons that are supposed to need valve relifs which are the 89 SOHC motor I think. The pistons are the ones that are supposed to give you a 11:6:1 CR.

Thanks