I am curious about this too because i have an 18Rgeu in my celica, with 88270 head and factory efi, but seems to have slightly domed pistons..(i have pics from when we had the head off) So i was sondering if i should have the earlier cams aswell to accomodate the slightly higher comp. ratio?
I may have an 88250 bottom end with an 88270 head etc.. but i know for sure the cams are 88270 items.