I put together a 1st gen b16a head from a 89 crx sir, with a 2000 civic si bottom end. I reused the stock head bolts, and used a brand new cometic headgasket sprayed with copper spray. Everything was torqued down in sequence, and double checked. I just started the car and there is a massive oil leak coming from the back of the block, between the bottom of the head and top of the block. It appears that the oil is spraying out where the head and block meet, but when i pulled the plugs out they are completely dry. I have done probably 10-12 engine builds before, including complete rebuilds and this is the first time i have ever had a problem. It seems to me that an oil passage is blocked in the back of the head where it is shooting out, but i checked when i put the head on for any problems of that sort. I am at a loss of where the leak is coming from, and i really dont want to pull the head to check unless i absoluetely have too. If anyone has any ideas, please help me out.