disco2 v8 4.o;tr coolant loss still

hi having rebuilt my 4.0ltr i am still losing coolant.

have done all the checks andwas fitted with a recon block so i know the block is ok.
the ehads looked ok when i fitted them , but now iam thinking maybe its one of the heads.
what heads will fit my 4.0ltr 10 bolt heads.
has any body got any idea as iam thinking of putting somthing else in if it will fit

many thanks

didn't you have the heads crack tested and skimed?
any head from a rover v8 will fit if they are 14 bolt ones you need to remove 30thou to give you the same cc as the suffix b heads 10 bolts