Looking for some Moparts advice for filling a ring groove in a block. A previous owner of a block used an Isky tool o-ringed the block. Now the holes need to be filled with the copper wire (0.040/21-gauge). How do you ensure there is no leak path when the two halves come together? There will be a small gap I’m sure. Anyone have experience with this process and have any advice? Would prefer not to deck the block to remove ring groove.