ok guys, i changed out my cam seal saturday. ive changed out tons of the cam and crank seals on little SOHC motors. in fact, 2 days before i did the seals waterpump and timing belt on an 89 tercel. welp i go to start the car,and it just cranks. i know i didnt move anything timing-wise. doesnt make sense. nothing is off, ive even tried moving the distributor and its set for the stock location. top it all off, i missed autocross. the girlfriend in the 240sx has been bringing me to work all week. this is where i left off sunday, after cleaning EVERYTHING. dmitri and i replaced the plugs, the spark sucked. we re-set the timing again. still just cranks. i have spark, i have air, and i have fuel. tuesday, bought a compression tester. tested it on the 240sx and it was great - but i have ZERO compression in any cylinder. thursday, i rotated the cam 180 degrees. heard clicking, so i put it back. sucks... any help would be appreciated. the head is an interrupt head. everything is the same as a D15b7 except i have an internal coil.