I am putting a Head on a 1.6 16 valve engine in a 1996 Sidekick 2door 4x4 and it was already taking apart. My problem is the cam sprocket has two different slots that it can be installed on the cam. I need to know which one to index to the cam. The other problem is I went by All Data Instructions to time the engine and when I turned the engine over I had no compression, obviously I screwed up. I brought the piston that is closest to the front of the engine which I thought was # 1 up to TDC with the v mark on the crank pulley and aligned the cam sprocket with the mark that it called for in the Instructions, adjusted all the valves as it said. That's when I tried to start the engine and it had zero compression, If someone could walk me through a couple of these steps that I am not getting I would appreciate it . 

Thanks for all the help this site is cool ! 

Did you jump over to Acks Faq and check out the FSM (Factory Service Manual) he has on-line?  That is going to be the best place to start.

On the cam sprocket, one of the "spokes" has a raised bump and an "E" on it, that is the mark you use for cam timing.  When that mark is up (at 12:00), then that indicates piston #4 (the one closest to the firewall) is at top dead center (TDC) on the compression stroke.  The crank pulley mark should point at "0" on the timing belt cover.  Then, if you rotate the crank 360*, so that the crank pulley mark lines up with "0" again, the raised bump and E on the cam should be at the 6:00 position.....that indicates that piston #1 (the one closest to the radiator) is at TDC on its compression stroke.
If you need to put the cam pulley back on the camshaft, then the pin slot that is opposite of the raised bump and E is the one you use to position the cam on the camshaft.
So now that you know how the engine timing is set, you should be able to get everything positioned correctly.

Thanks for the help, found out that the rotor in the dis was on wrong. Got it running, man what a relief.

That is a big " whew " moment. A lot of us have been there, glad you got it going.

Thanks for the help, found out that the rotor in the dis was on wrong. Got it running, man what a relief.

Yep, I have ran across that issue before too.