yes you can but if you are worried about SP you can get some rubber gaskets but you might need longer UNC 6/32 screws thats if the rad has those depends on the rad some have m3 or m4 XSPC are UNC 6/32 screws if you do i have used those rad backets in push/pull config in the past
sorry just one warning if you do get larger screws and gaskets then measure the screws carefully cause if they are too large they will damage your rad