My friend has a 90 integra. Not sure on what kind of engine it is, but i was going to race him with my civic si, and when he went to take off the car went POP! POP! blowing out black smoke, and died. He tried to start it back up, but wouldnt start. It would just turn over. Was thinking that it jumped time, but not really sure. Took off the valve cover and took out the spark plugs, and they had some oil on them, and they were not damaged at all. Just wondering what might have happend and just wondering if the arrows on the stock cam gears are supposed to meet or stay parallel with each other. If anyone would have an idea on what might have happened I would greatly appreciate it. Thank You!