My buddy is selling the wrecked phazer and bying this sled. The owner says that it has a problem with blowing head gaskets. He replaced the head and it still did it so I'm leaning towards the cylinder being warped.I noticed its a piston port motor and it is piped. I'm just wondering what problems if any we will run into since I'm his sled mechanic. Is it a good sled or did they have problems like the later 650"s?