Discovered a cracked head in my 206 engine. Looks to be hair line from # 3 (thought #4 at first)cylinder to the outside of the head on the passenger side. It feels like it penetrates the water jacket in the center of the head thus explaining the foaming radiator. The rhymatic pop pop pop must have come from the exit point under the side cover. Maybe it can be welded and the head milled. Think the block should be decked? Don't know why the head cracked unless it was not straight. I didn't torque those head bolts so I don't know if the builder did. What about new head bolts? Don't have much experience with these low compression engines, stove head bolts, and welded heads. Any info would be appreciated.