I just rebuilt my gsr block with all new internals. the head was pressure tested and vaccum tested and came out perfect. I also have a new headgasket and arp headbolts.

but I still have a oil leak from the headgasket,right above the b18c1 stamp. and I"m also mixing coolant in my oil. I have 180 compression on all 4 cylinders, and when the head was off it looked lke the HG sealed just fine arond the combustion chamber.

could it be possible for the block to be warped. and also could this be the problem with my coolant in oil problem? TIA